Dire maul instance ( its a dead instance that people only go to, to kill rare spawns and paldin and warlock epic mount quests )
skarr, mushgog and the razza spawn in the arena, in the middle of the 3 instances, ( north, east and west ) every 6-8 hours, i just soloed the razza as a lvl 70 warlock, wanna fight skarr and mushgog again :) hope this helps u out m8.
dire maul is located in feralas.