Last gate of the emperor

"Yared Heywat lives an isolated life in Addis Prime -- a hardscrabble city with rundown tech, lots of rules, and not much to do. His worrywart Uncle Moti and bionic lioness Besa are his only family... and his only friends. Often in trouble for his thrill-seeking antics and smart mouth, those same qualities make Yared a star player of the underground augmented reality game, The Hunt for Kaleb's Obelisk. But when a change in the game rules prompts...