Best of the lot so far, hands down. Finally bringing together all the sci-fi elements he's been hinting at for a few books. Very cool to see what goes down.
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Summary for my future reviewing
Ashok wakes in a Fortress dungeon where he's been tortured and in had been in a coma like state for almost a year, thanks to the shard of Angruvadal that's lodged in his heart and keeping him alive. He survives Fortress and heals up with the help of some monks who seem to have a connection and relationship with Mother Dawn (a celestial supreme being that is either an AI construct living in the space facilities above the world, or a type of immortal probabilistic future predictor trying to keep hte demons/aliens at bay).
Ashok buddys up with someone from the collectors guild, who search for treasures in an undersea tunnel that connects Fortress to the mainland. Underneath, there is tons of old Ramnowaran tech, ancient cities, and stuff meant to be of use to future humans to fight the demons. Ashok defeats a guardian and gives Fortress access to the secret Ramnorawan city, asking them to help him fight off the Capitol, and they go discuss it while he goes back to save Thera and the Son of hte Black Sword. He arrives at teh Cove just in time as a black steel bearer and his men are killing everyone. Ashok defeats him and takes the sword as his own, after Mother Dawn appears to him and he calls her out. She tells him all black steel is angruvadal with different names so he takes the sword and rides out to find Thera. As he does, the sword transforms from the curved blade the prior bearer preferred to the classic style Ashok uses (some sort of smart steel/nanotechnology).
We learn Javed, The keeper's right hand man in the Cove, is actually a witchhunter who is reporting evrything back to Omand (head of the inquisition). He starts to have a crisis of conscious as he starts to "believe in something" for hte first time ever. In the end, he sells out Thera and the Sons as they attack teh water aqueduct (after he killed to cove children when turning in to a tiger). He doesn't seem to exactly want to be a bad person anymore, but as his caravan with Thera kidnapped is moving along, Mother Dawn appears to him, let's him know the Keeper is dead, and that he must return and be the new Keeper of Names and lead the Sons against the new threat (which will be the demons/aliens and not so much the Capitol whcih is slaughtering all the casteless). He agrees to take on the mantle, but then Thera's ex husband finds them and takes her back (how it ends).
Thera has an episode from teh Forgotten that all see in the Cove, she says that "without water they will fall" but the meaning is distorting for whoever hears it, as they blow up one of three water aqueducts to the Capitol, the raiders drain the Cove's reservoir to break in, and they consider hte demon implications.
Omand ends up is a master sorceror and can use demon bone to not only blow things up, communicate with his people, but also step in and out of reality (like side stepping the dimension then back in - appearingly what Mother Dawn does too). He's in cahoots with a demon he trapped a long time ago and keeps in the Inquisition Dome in a tank of water where he communicates and learns its secrets and harvests its magic. The Demon had been listening to all his comms (bc theyd been using its bones) and tricks Omand in to unleashing a demon swarm in Vadal countryside. the swarm kills tons of soldiers, but Thera uses the black steel mirror to call a weapons strike from one of hte moons (ends up the moons are actually space installations/ships the ancients used to have a mega space battle with the demons and are now remnants left to ensure the demons dont take over). They send the last massive missile/fire strike that the whole world see and it annihilates 200 sq miles of forest and kills everyone except Thera and those in the black steel's protective bubble.
Jagdish is with her (same guy who had been in prison with Ashok and then took off with him)., and is loved by his men and everyone. Ends up by seemingly accepting a wedding proposal from a interesting woman with big ambitions.
Book ends with Ashok taking off with his new black sword to find Thera and rescue her and with some farmers looking to drink water from their well, only to find its now salt water, even though are way inland. That's bc before hte trapped demon was killed by Omand, it sent a magic message to all its demon ppl that "its time" essentially to attack the mainland and kill everyone since they had convinced Omand to kill all of Ramnorwan's descendents (the casteless) and why Omand was killing eveyone. the trade they made was to give Omand access to some ancient tech that will make him immortal and all powerful.
So next up, Omand is out searching for his new ancient relics, demons are attacking the mainland, Thera is kidnapped, Ashok is even stronger and has a new sword and has Fortress behind him.