Seems the drop rate on runes has been nerf'd. Been killing these for quite a while and no runes have dropped. Most mobs are empty now except for the random bone or meat.
They also FLURRY. So a round of 5, 1k hits can really catch up on you. They are slowable (I think fully) and they are snareable although they don't flee so snare is not going to help much unless you're a necro.