Shadow Slave, book 1 :Child of Shadows Guiltythree2022

Growing up in poverty, Sunny never expected anything good from life. However, even he did not anticipate being chosen by the Nightmare Spell and becoming one of the Awakened - an elite group of people gifted with supernatural powers. Transported into a ruined magical world, he found himself facing against terrible monsters - and other Awakened - in a deadly battle of survival.
What's worse, the shadow powers he received happened to possess a small, but potentially fatal side effect...