Hydra - The Army of Undead Wielders - Book 1

In a reality where traveling through dimensions is something normal, a war against the Gods of all known dimensions are happening. A single God known as Shin, the God of the Crystal, the one who made travel through Dimensions possible, corrupted by the depression of the Void, creates a army with those who he once choose to help aid all Dimensions, now with the mission to destroy it.

Without memories of her past, Hydra, a mermaid from a lost dimension called Unda, see lost in a room with her diaries. The God tells her that she formed a pact with him and now, she was reborned and had to fight in his army. With no clue of what is happening, she accepts.

Reading her diaries to know about the past and trying to fit in this army full of immortal warriors, she tries her best to figure out what kind of pact was that and the reason behind her lost memories.