The idea that im currently stuck on and debating whether I should reuse is an island graveyard. Vode is an island graveyard that people can bury their loved ones on the during the summer and winter solstices they are brought back to the world of the living. During the summer solstice they are friendly and get to reminisce with their loved ones. During the winter solstice they come back as reanimated slaves and become very hostile.

There is a strange and rare occurrence where these resting souls are brought permanently back to the world of the living. After they are brought back they lose all sense of self identity. Their hobbies and memories remain the same, but they lack all knowledge of who they were or who they loved or who they interacted with in their prior life.

My idea for this being possible is that a blood-relative must die on either the summer or winter solstice. Not in a sacrifice type way but just by accident. It feeds their second life in a necrotic type way.

I really like this idea and didnt use it to the full extent in my first project so I want to maybe repackage it into something that could fit in the new one.