Here is my basic GDD on a game I would like to design. A version of diablo taking place in a modern setting.
Vampire GDD
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liked the idea of diablo 
, have you thought the idea of how the main char would live?, i mean would it be totally like he chasing an evil threat through idk, ny or a modern city, but would it be of popular knowledge that there was this evil lurking in the world or would it only be him vs that Evil.
Definitely a good idea, I think it would really need to see the game set with some heavy abilities system and maybe a skill tree, base on a vampire style (for example the character jumping on a foe and sucking is blood and strength ) I think I would love a part in a game in a dark forest but for all I really hope to see a game out of this. If you want any help just ask
Good Luck 
Actually had a story in mind for years about where you are a vampire who id’s running away from a lab who was experimentingon you.