The Bitter Sixteen Trilogy: Book 3 by Stefan Mohamed
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Cynical, solitary Stanly Bird used to be a fairly typical teenager - unless you count the fact that his best friend was a talking beagle named Daryl. Then came the superpowers. And the superpowered allies. And the mysterious enemies. And the terrifying monsters. And the stunning revelations. And the apocalypse. Now he's not sure what he is. Or where he is. Or how exactly one is supposed to proceed after saving the world.
All he knows is that his story isn't finished.
Not quite yet ...