It's possible that:
* This is a fictional character or concept: You may have encountered this in a book, video game, anime, or other work of fiction. To help me understand, could you provide more context about where you came across this?
* It's a specific character from a niche community: If you're part of a particular fandom or online community, there might be a specific character or meme known as "William T" and the "death scythe" could be a reference within that group.
* It's a misunderstanding or misremembering: It's possible you're thinking of a different name, character, or weapon.
Please provide more information so I can help you find what you're looking for!