This is Sean Whalen (prion).
Urus. Bos primigenius. Also called the aurochs. Ten foot long bovid. Domesticated by humans. Now extinct. Criminal. Associate of Auk's. Sentenced to the pits. Led group. Gave information to the Trivigauntis. This is the only species used as a name in the books that is extinct. Saying the letters in the name sounds like "you are you is." This reminds me of Mint telling Urus that some people are just naturally bad and can't be changed, you are what you are.
prion