The offer is there.
The game is called "A Demon Hunter's Guide to Passing Finals". You play a new student at a prestigious demon hunter academy, and as such you get to fight demons, and when you defeat them you can get a piece of the essence of that demon which can then be used in potions or weapons/armor/accessories.
All I need at present is help brainstorming names for demons and other creatures of darkness, and then their essence items and fine-tuning the other crafting ingredients I have developed.