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Halo #34

Halo: Outcasts

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An original novel set in the Halo universe—based on the New York Times bestselling video game series!

2559. Formerly one of the Covenant’s greatest and most fearsome warriors, Arbiter Thel ‘Vadam is now allied with his former human enemies while deeply entrenched in leading the Sangheili people to a new era of unification. But his aspirations are under constant threat, whether by the dangerous, warring factions of rival Sangheili keeps, or the relentless shadow of oppression spread by the renegade artificial intelligence Cortana​​.

An opportunity to break Cortana’s chains has suddenly presented itself through the rumored existence of an ancient artifact located on the hostile world of Netherop. Spartan Olympia Vale, trained with the skills to live and thrive among the Sangheili, also recognizes this alien prize as an essential means to aid humanity in reaching the same goal of freedom. But behind the scenes, both ‘Vadam and Vale are being manipulated by a mysterious figure with their own agenda. And to make matters worse, all involved are unknowingly placing themselves at perilous odds with forces beyond their comprehension…

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First published August 8, 2023

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About the author

Troy Denning

185 books662 followers
Also known as Richard Awlinson.
See http://en.wikipedia.org/wiki/Troy_Den...

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5 stars
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218 (43%)
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91 (18%)
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Displaying 1 - 30 of 39 reviews
Profile Image for T.R. Preston.
Author 6 books186 followers
September 2, 2023
I read the paperback of this, but cannot find that version on Goodreads for some reason.

This was great. It's very disappointing that 343 does not make better use of Arbiter. The fact that he hasn't had his own spinoff game yet should be considered a crime
Profile Image for Louis Curtis.
19 reviews1 follower
November 3, 2023
So disappointing that Halo fiction has reached this state of stagnation. Denning and Kelly Gay, while talented writers, have such a similar writing style that every book that comes out lately feels like the same exposition-heavy and stale story dressed up in a different skin.

I used to come to Halo novels to extend my understanding of the mythos and learn more about the timeline but lately it just feels like all the stories are inconsequential, teasing another huge plot point that ultimately is never raised again. Some better stories told by more expressive writers are needed in this space.
Profile Image for Chris The Lizard from Planet X.
460 reviews10 followers
August 24, 2023
Halo: Outcasts By Troy Denning, is a media tie-in novel based on the Halo video game franchise.

Set in 2559, a year after the rouge AI Cortana betrayed the Master Chief and the UNSC, and used the Forerunner constructs known as Guardians to impose marital law on key interstellar civilizations across the galaxy. During this chaotic time various factions throughout the galaxy try to resist Cortana’s rule anyway they can. When Arbiter Thel ‘Vadam and Spartan Olympia Vale see an opportunity to turn the tide by chasing a rumored ancient weapon, they begin a race both with and against allies, discovering a plot of intrigue and danger and a new threat to them all.

Author Troy Denning is no stranger to the Halo Universe. Outcasts is the seventh book he has written for the Halo franchise, along with a short story in Halo: Fractures. Although Halo: Outcasts indeed expounds on characters and locations that Denning has explored in previous novels, this is a standalone story that is designed to be easy for any fan to pick up and engage with even if they haven’t read prior Halo books.

As Outcasts begins, Cortana’s tyranny hangs over everything. To even speak of fighting back is dangerous, as her eyes and ears are everywhere. The Arbiter is driven by the desire to create a better world for Sanghelios, and when he learns of an artifact that might help them break free of Cortana’s oppression, it is too much to pass up. Separately, Thel ‘Vadam and Spartan Vale travel to the mysterious planet Netherop in search of the artifact. They are not only in a race against each other they must reach Netherop without Cortana and her Created realizing what they are doing. Over the course of the journey, they face both new threats and a reckoning of their past.

The planet Netherop is a location that Troy Denning is highly familiar with, and it is very fitting that he continues the planet’s lore in a story that unites what came before and what will come next. The secrets of the location take center stage throughout the novel, and the planet itself is essentially a character in the story. As the cast of characters nears the artifact, the danger grows. Both Olympia Vale and Thel ‘Vadam must decide who to trust and who the greater enemies are. As two characters who have been outcasts themselves, they must each acknowledge the past while fighting for the future.

The dynamic between Vale and The Arbiter is fantastic in Outcasts. Troy Denning knows the Halo characters well, and it is apparent throughout the novel. The two have a history together, and since Vale is stationed on Sanghelios, they must work together in the post-war era. While there is trust and respect between the two, they each know they will have competing motives when pursuing the artifact.

The artifact isn’t the only revelation The Arbiter and Vale experience along the way in Halo: Outcasts. When they encounter Rosa Fuentes and Petrov, they are reminded that the peace they have achieved is fragile at best. For characters like Rosa Fuentes, whose life changed on Netherop years ago, and Amalea Petrov, who physically and emotionally never could leave the battlefield, the conflict and hatred rage on. Vale and Thel “Vadam must contend with these characters who are still trying to fight the last war while trying to find a way to overcome the current oppression from Cortana.

That element is the best part of Troy Denning’s storytelling in Halo: Outcasts. The story in Outcasts is so game-changing that it could alter the future of Halo storytelling in a colossal way. It’s important to note that 343 has already squashed rumors that that would be the case, but there will undoubtedly be a shift in the future of Halo narratives due to Halo: Outcasts. A new evil is revealed in the book’s third act, and it is something that The Arbiter, Vale, the UNSC, and everyone else will have to contend with in the future.

I’m a sucker for excellent character development and dialogue inside a layered narrative with some intrigue when reading a novel. Troy Denning as he typically does delivers in a big way with Halo: Outcasts. He is the perfect author for this story and these characters. The formula is simple: take established characters like Vale and The Arbiter, insert a planet that we’ve seen before but still holds mystery, and expand on stories we’ve seen in other novels, notably Halo: Oblivion. Denning has both the experience and skill to do these elements justice. In Outcasts, he is in his element, and it shows with a beautiful narrative.

As outcasts, both The Arbiter and Vale seek their own form of redemption and a way forward. That narrative isn’t exclusive to them, though. Rosa Fuentes carries long-held animosity and guilt from her actions on Netherop, which drives her motivations here. Commander Amalea Petrov has been abandoned on Netherop for years with her troops, some of whom have never known anywhere else. They are reluctant to move on from the war and hatred that has consumed them. These threads weave together to create a fascinating problem for our heroes, and they raise the stakes as they pursue the artifact.

A new evil is manipulating Vale and The Arbiter throughout Halo: Outcasts. It’s this element of the story where Denning opens the doors to new possibilities. Cortana is a fascinating villain—especially as AI increasingly surges into our lives in 2023. However, a new threat acting in a sort of puppet master capacity provides so many possibilities. When I finished the story, I was excited about the possible directions Halo expanded universe could go after Halo: Outcasts.

There are over 30 Halo novels at this point, so it can be intimidating for someone new to the books. The best thing about Halo: Outcasts is that it’s written as much for someone brand-new to the books as it is a hardcore fan. Denning is a great Halo author, as he has much love for the lore and the characters within it. For seasoned fans who have read all the novels, Halo: Outcasts will be a really rewarding experience.

Ultimately, it’s a must-read novel for Halo fans. It’s one of the best Halo books and more than just a fun adventure. It paves the way forward for a storied franchise.

Profile Image for Joni Boyd.
2 reviews
September 10, 2023
Some really fun stuff in here, great exploration of pre-forerunner civilisation with some genuinely spooky and existential concepts. Also great to be back with The Arbiter. But a little too reliant on Dennin’s other Halo books and lots of time spent arguing over in tunnels. Vale is a bit of a bland character and the action is a bit lacklustre. And on a less serious note… no dual between Atriox and Vadam :(
Profile Image for Heidi.
69 reviews
September 16, 2023
Really struggled to connect with anyone here. Not sure if I wasn't in the mood for it or if it simply wasn't the best of the Halosphere.
Profile Image for Donal Menzies.
5 reviews
March 11, 2024
I am at odds with some other reviewers, which I find disconcerting. But I could not get enough of this story - in degrees menacing, thrilling, perplexing; the twists in the narrative are almost worthy of Hitchcock. Almost.
I realise only the most hardened Halo fans are going to read this novel but there truly is something for everyone in this offshoot of the greater Halo narrative. The author makes the reader’s job easy through the deft descriptions of The Arbiter and his “alien” mindset, aligning us with the main character, and surely to have an audience empathising with the foreign rather than the human is a triumph of writing. And then there’s the action! Exciting and unpredictable outcomes in well-described locales and sequencing; this is satisfying stuff for sci-fi lovers. All the intricacies of the narrative are framed against the dark machinations of Cortana, the rogue and “rampant” AI, and I just can’t wait to see how this all plays out.
Profile Image for Jared Delcamp.
204 reviews7 followers
June 10, 2025
A lot of important things happen between Halo 5 and Infinite that aren’t talked about in the games making you wonder what you missed. You probably missed nothing from the games and a lot of what you want to know is here. The mysterious planet of Netherop has a lot of interesting things going on discussed in this book. Spartan Vale was not it in the games, but shines in her novels. Mystery, alien tech, good characters, and action I got 5 stars for that.
Profile Image for necronizer.
86 reviews
December 15, 2024
I kinda struggled with this one, not gonna lie but it's probably because centering the whole plot on a macguffin right from the get go, one that we've never ever ever ever heard anything about in mainline games or other lore drops, did seem to be uninteresting but the journey to that macguffin and the plot surrounding it with characters and ideas was interesting enough to keep me going.

Right off the bat though, the transition from Halo 5 to Infinite has been such a disastrous thing for this franchise that we still get books coming out bridging that gap, that even the great Kelly Gay had to weave her story of the Didact's redemption around Halo 5's events lol. This book does not really do justice to either Vale or the Arbiter and it does essentially nothing in bridging that gap too.

A disappointment to be very honest and at the very least.
Profile Image for Ricky Beckett.
223 reviews13 followers
August 23, 2024
It’s November 2559. Arbiter Thel ‘Vadam and Spartan Olympia Vale depart Sanghelios on a mission to acquire a weapon on a hellish planet called Netherop that is rumored to have the capacity to destroy Forerunner Guardians, hoping to use it against Cortana’s Guardians and her Created.

Before reading this book, I would recommend reading a Master Chief story first, ‘Halo: Oblivion,’ which takes place 33 years before this book. It’s vital to understanding the cast of characters and the environment of Netherop’s hellscape. One of the things I liked about this book is how Denning explores the fragile politics of the new alliance between humans and the Sangheili—needing to carefully navigate the infancy of this alliance lest they accidentally start another war between the species.

What I like most about this book is that it gets so sci-fi that it borders on the edge of becoming fantasy. It’s not exactly a blend of genres, but the technology the characters come across is so advanced that it might as well be magic. I won’t say why that is because of spoilers, but it does add more mystery to the Halo universe, and it makes me excited to possibly read more about it in any potentially future books to be published.
Profile Image for Casey Millington.
36 reviews
November 27, 2025
As one of the recent entries in the series of Halo books, this entry focused on the fragile relations between Humanity and the Elites well after the events of the main video game trilogy. Centre to this entry is the Arbiter and Spartan Olympia Vale working together to recover a fabled weapon lost on a distant world, one supposedly created an incredibly ancient and highly advanced species, and capable of being used to fight against the current threat to the galaxy: Cortana. This was a very enjoyable and strong entry from Troy Denning, a veteran writer of the series, who employed a wide range of characters we have previously met during the Halo books, as well as a number of new and interesting characters that fit in well to the current state of affairs in Halo's lore. New lore and features are always a welcome sight and expanded upon really well by Denning during this book, such as the Arbiter's alliances with other Kaidons, the lore surrounding Oath Wardens, humans affairs outside of the main factions we know, and more lore from amongst the Banished's ranks.
Profile Image for Andrew.
531 reviews15 followers
August 19, 2023
I listened to this book via Audible.

Halo: Outcasts takes place before the events of Halo Infinite but doesn't really tie into them much, making it a fairly standalone novel. Plenty of the characters have been encountered before, but this is an all-new adventure and one that may have some interesting implications for future Halo fiction.

Troy Denning crafts a well-plotted story that is paced perfectly to want to keep you reading. There's always something about to happen that you want to learn just a little more about. You never want put the book down just yet. There are plenty of clues about what will happen next, but only enough to give you hints, which keeps it exciting and full of surprises. If I can find any criticism, it would be that the large number of Sangheili names can be a bit difficult to keep track of, with at least eight main alien characters. Some are pretty distinguishable, but at times it was a little confusing.

Overall, this was a solid addition to the Halo canon that I thoroughly enjoyed. Even if you're not a fan of the games or the universe, sci-fi enthusiasts should find something they like here too!
22 reviews
August 23, 2024
Not sure why this only shows up as an Audio book on this app?

This was fine. I was significantly more interested in the Sanghelli stuff than the human stuff, but the story felt sort of generic.

The older Halo books did a great job expanding the lore and filling in gaps between games. These newer books never feel like an important chapter in the universe, and you know the story will be fairly safe because they WONT have a major plot point in a book.

As such, this story feels sort of inconsequential. We know that the weapon they're looking for doesn't matter because we already know how the Created conflict is resolved. This wouldnt be a problem if it had anything major to do with the characters, but it's doesn't.

It's not a bad book, it's good some cool moments, it's always great to get more Arbiter, fight scenes are pretty well done, and while I don't think the Banished were necessary for the story I always enjoy an Atriox scene.
Profile Image for Jesse Bartel.
86 reviews6 followers
August 16, 2023
I think one of my favorite elements Denning provides with his new novel is the uneasiness of the alliances in this post-Covenant War era. It feels like every chapter could end in bloodshed due to miscommunication but the cool heads of The Arbiter and Spartan Vale prevail. But that tension is felt and it’s important that not everyone is exactly friends - they just have a common goal. Even humans within the human groups have their own motives that they act on and create worse situations. I appreciate the lack of black and white when navigating around the morals and values of all parties involved. I mean, even the lunatic Atriox is admirable in his way and can we blame him after what Cortana did to his people?
86 reviews
August 18, 2024
I feel at times that Halo is stretching the lore to its limits with some of these novels but as usual I was consistently entertained throughout reading Halo Outcasts. Troy Denning did a great job of following up on threads he started in Silent Storm and Oblivion while bringing in Vale and Arbiter as main characters who worked great together and I hope to see both in a future game again. Outcasts, like many recent Halo novels, follows characters on a specific mission that is resolved at the end but still setting up many interesting threads to be pulled on in the future such as whatever was going on in the last 3 pages. Not my favorite Halo book nor even a favorite by Denning but I quite enjoyed it.
21 reviews
March 21, 2025
I joked with my brother that I couldn’t wait to watch a YouTube video explaining what I read LOL. The book is fine. The plot overall is solid and fill in the universe what happened with Arbiter after Halo 5.

But damn this book was boring and confusing. I can barely even remember the human names in this book, let alone the Sanghilli names as well! I’d have to look it up what everyone’s names were and what their purpose was. It’s just confusing to me. Even the book, Halo: Epitaph, was easier to understand. I think that books plot was more investing and the names were easier to remember. Forerunner names and ideas are easier to understand than Sanghilli.

Wish the book was better, especially since I saw a LOT of positive reviews from the Halo community on this one
Profile Image for Alek Hill.
341 reviews
November 1, 2025
It was nice to finally get a post Covenant-War perspective of the Arbiter in one of the Halo books. As one of the franchises main characters we really don't get a lot from him.

That being said, even though this was an Arbiter story, it really didn't do much. The whole hook of the plot was the Guardian killer weapon, and personally I felt it was a lackluster MacGuffin. The very brief and hypothesized theory we get from Vale and her scientist friend were not enough to strengthen how pointless the weapon ends up being. Perhaps if there had been a bit more exposition and back story given on the planet's history or the weapon it might have been a better book. But instead of adding to the lore it was really just a lot of nothing.
This entire review has been hidden because of spoilers.
Profile Image for Keelan.
89 reviews12 followers
January 30, 2024
Given Goodread's idiomatic rating system, a 2-star is actually a bit generous, but there were parts of this book that did resonate-- few and far between.

I don't have time to write an extended review right now, but suffice to say, when it comes to a well-established universe like Halo, the devil is in the details; and the details were wrong a lot of times in this book.

As per usual for Denning, the characters felt heavily inconsistent with their presentations in earlier media.

As much as I love the Arbiter (I do), this book is one of the few in the Halo canon that is, imo, skippable.
47 reviews
November 29, 2025
I actually really liked this book, the prerequisites for this book are hunters in the dark and oblivion, for arbiter fans it more than delivers the arbiter is as usual shown to be the unbelievably level headed leader who consistently makes the right decision for his people even at personal cost. this book describes Olympia Vale now as a Spartan and the arbiter Thel Vadamee competing against each other to find a rumored weapon that can destroy one of Cortana's guardians. if you haven't read oblivion this book will leave plenty of things unexplained but having caught up on the source material it's an enjoyable read all around
339 reviews13 followers
April 21, 2024
Cortana still somewhat controls the known universe. Various groups are trying to break her grip. There may be a weapon left by someone even the forerunners feared, left on a little visited planet. Various groups travel there to try to reclaim it.
Since this is a stand alone novel, It will be interesting to see if the events of the story play out in future stories. Overall the story was alright. Lots of actions, but there are parts it, will things got confusing. Maybe if I played he Halo games it would have made more sense.
Profile Image for Thijs.
387 reviews5 followers
September 24, 2023
An interesting novel from Halo's canon expansion. However even after reading this I don't see how it fully influenced Halo Infinite. I do hope to see that soon though.

From an emotional/character POV book it's also a very nicely written one.

However, the plot in the beginning can be a bit meh. With a fair bit of exposition being in the way, and the Technobabble to explain it is quite cringy and annoying too.
14 reviews
November 21, 2023
The book was worth it to get more about the Arbiter and the other Alien races of Halo, but otherwise it was just okay for me.

Olympia Vale is a boring character and I felt no reason to care about her. Her relationship with the Scientist in the book was odd and felt very forced.

Read this if you are desperate for more Halo content involving the Arbiter, otherwise, this falls well below the standard set by the Old Halo Trilogy (Fall of Reach, The Flood, First Strike).
Profile Image for Andrew.
1,010 reviews42 followers
August 22, 2023
This was a lot of fun with a great cast of characters who are all smart enough to avoid the tropes that I was expecting.

Some of the tunnel fight scenes can be a bit disorientating to read at times and hard to envision but that was the goal of the scenes.

The Arbiter rocks, more Arbiter books please.
1 review
June 3, 2025
Listening at work, I'm 5 hours in and next to nothing has happened, time spent on Sanghelios that could have been used to flesh out the lore of the elites was wasted, everything since has been worse. If was actively putting aside time to read this I'd have thrown the book in the fire by now. Will update review when finished.
Profile Image for Tom Donovan.
23 reviews
November 28, 2023
Definitely some of Troy's better writing. Less unneeded, overly detailed fluff, and more character building and place setting.

The Oathkeeper is definitely one of the better characters in the Halo canon.
Profile Image for Bryan M Wiest.
4 reviews
January 16, 2024
When it comes to the Halo series I find all the actual novels to be very good reads, but Mr. Denning's have a different feel to them that just hooks you faster and keeps you there. His character development and story telling are hands done some of the best I have seen.
Profile Image for Elric.
31 reviews
March 25, 2024
It was awesome through the entire book, action packed as soon as they touched ground on Netherop/N'ba/Neska(read the book to find out what those names mean) Lot's of arguing in the tunnels while the UNSC just landed on the tel. But other than that, Awesome!
Profile Image for Bigboy117.
8 reviews2 followers
April 10, 2024
Wow weee baby! I love me some arbiter! A very good book that just builds the world and takes us back to a familiar place :) . I love anytime we are on sanghelios and dealing with their politics. Also love a mysterious planet with a mysterious hidden power!
Profile Image for William Hatchett.
32 reviews
December 18, 2024
This story was a beautiful return to a piece of Halo history. Returning to Netherop and seeing what was left behind was so well done. The story did slow in the middle and became a little frustrating, but it was a very well written tale.
Profile Image for Dack Powell.
93 reviews11 followers
January 16, 2024
I always love views into the Sangheili culture and the Arbiter continues to be such a great character. Overall very enjoyable.
Displaying 1 - 30 of 39 reviews

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