Rise of a Dark Lord

Based from a book I'm working on: You are outcasted after you release a magic power you had no idea how to control, as you collapse in front of a dungeon, You are saved by a woman who lives with the residents of the Dungeon who need a new Dark Lord to defend them from Cultists, Villagers and Greedy King Zen's soldiers, will you live up to your new responsibility to control the thing within? or will it consume you?