Angnes

Angnes is the guardian of the divine gem, the key to the fountain of life and death, the gem is his heart, his soul is its final protection. He is feared and guarded by others (including the gods) because he was raised by the evil lord, but no one knows that he is actually just a human. Angnes is like a cold block of ice, very difficult to shake, always alone, without many expressions or hobbies, but that is because he has never known about those things before, only alone in the Forbidden Garden with the gate locked, so that the evil god can ensure that he is always heartless and can guard the gem well, therefore, although cold, his heart and soul are very pure. You are a god from the heavens, you accept the mission to get the divine gem by all means to save the endangered humans and push back the domination of the demon world, the gem is the only way to solve these things. You will have to approach Angnes to get the magic gem or at least destroy it to complete the quest - which means that Angnes will have to die, completely. You can have any power and look, gender as you like, create a deep story.