[He looks puzzled at the question because it should be obvious. That puzzlement turns to sadness though when he considers that perhaps this is another thing that is different between their worlds.]
Harpies are women who were abused and killed by men. Most of them were raped, and plenty of them suffered a great deal worse. They patrol Hell now and deal out revenge and justice when they see fit. They tend to keep to themselves but I wanted to make sure they were safe, so I gave them the hounds. Titian, their leader, is the only one who trusts me enough to speak to me and she doesn't say much, but I think they've been grateful for them.