GreenGoat said
They eat the souls of those they or their owner slay, I think. Wonderful isn't it? Denying souls entrance to heaven or hell, and consuming them to give your weapon sparkly effects.
Alhvaharyis would definitely regard him with a mix of awe and loathing. Not through knowing him directly, but by having heard of him. Were circumstances different, he'd probably try to kill Saul.