The two horned ripper doesnt drop anymore but it is sometimes put up on auction for several mil. The pixie stabber drops off the talimir warden and the cat that spawns to the west of him in the ravine. They are both somewhat quick spawns and they drop many different rares. Oh ya they are west from wynhaven on the south side of the mountain. And the faction they give is a crap faction so dont worry about needing it. ..... if i remember the name of that cat ill repost.