I had to do 120 runs of The Grand Cosmos for the sake of Healing Jacket, and to say it was a pain is equal to say nothing. I hate this dungeon with a passion now.

Imo, they should add same "1 run = 1 unique item you don't have in your inventory" system for all dungeons from previous expansions that we now have in leveling dungeons. This way we at least could leave this endless farm for later if we're absolutely unlucky. Even getting savage weapons is easier. :/