Shadow Slave (6 book series) Kindle Edition by Guiltythree 600 chpters

From Book 1: 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.