Find seven hiding holes, or "hydeeng hols", in Tenebrous Tangle. The holes look like the end of a barrel. Some are in the ground and some are in walls. Right click each barrel to update the quest. Although you can search for the holes in any order, one of the most efficient routes is as follows:
(Note: if you can't fly, use the teleport pad at ( 220, -226, 166 ) in the Hidden Refuge. It is labelled Breeding Grounds, not Vicious Breeding Grounds.)