Ryld’s Shadows by Angel Martinez

Ryld must learn to control his dangerous shadows before they kill someone he cares about or someone unscrupulous learns how to control him.

AURA’s offices have been quiet since the mage tower incident—as quiet as they can be for an agency dedicated to policing holes in reality—and the department heads have been free to turn their attention back to mundane matters. The return to quiet bureaucracy gives AURA’s Director of Research, Kai Hiltas, the time to turn his energy to a new issue—a young drow with unusual and dangerous powers named Ryld.
Though his shadows always lurk at the edges of his vision, Ryld does his best to live peacefully and not let them hurt anyone. He has his work, his apartment and a succession of minders assigned by AURA who are, ostensibly, there to keep him safe in his new world and to prevent him from causing any scenes with his shadows. Most of the time, the arrangement works. But one disastrous incident causes Ryld’s minder to leave him unattended and lost—the precise thing he was hired to prevent.
To replace the faithless minder, Kai suggests Hank, a half-goblin accountant recently in the middle of a string of terrible luck, while Kai works out how best to get Ryld the magical training he so desperately needs. For his part, Hank truly likes Ryld and insists he would be happier working as Ryld’s companion rather than as a controlling minder.
As Hank and Ryld slowly come to terms with sharing space—and eventually more—Kai’s search for a teacher for Ryld takes them out west on the invitation of the Elvenhome’s aelfe queen and right into the lap of inter-elven feuds, ancient prejudice, conspiracies and trafficking rings. What should have been a pleasant visit soon turns into more than even forever-scheming Kai can handle.