What's the Name of That Book??? discussion

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Kaï-ro
SOLVED: Children's/YA
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SOLVED. YA Fantasy about a boy who discovers an artifact with the power of an Egyptian god. [s]
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Along the way of the story he meets a slighly older male sidekick who is later killed in the battle. I do not remember the name of the sidekick. It might have been the case that this sidekick is changing alliance in the storyline, but I am not sure.
If I remember correctly it has a short significant title, but it seems a quite uncommon book as my research showed quite often books of Rick Riordan, who is definitely not the author. The author was male, but he is not one of the big names in book writing. The book itself was standalone ten years ago, meaning it had no prequel or sequel.
The storyline itself does not happen in Egypt and as I said, it is set in the nearer future. Unfortunately I do not remember, which entity empowered the main character.
While reading the book about ten years ago (give or take two more years,) it was published quite recently, so it is now probably 12 - 13 years since first print. It was a paperback edition written by a native English speaker. As for the cover, I somehow think it had red as a prominent colour, but I might be wrong here. Other than that, I have to pass for the time being.