Mannerism

Prone to predictions of doom

I'm quick to assume that someone is trying to cheat me.

Self-Knowledge. If you know yourself, there're nothing left to know. (Any)

My life's work is a series of tomes related to a specific field of lore.

Yes, and its a...

Monster. A monsterous enemy could be something as weak as a goblin to as powerful as a ancient dragon. They consist of monsterous races and creatures. They might have done battle with the creature, been robbed by it, wanting revenge, or hunting it.

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