Specifically the Burning Mage Lords and "____ the crazy" mages on level 5. These guys had some of the best loot pre-global loot change as they are very hard to kill. Currently The Mage lords loot is over populated with scrolls and reagents - which seems to be limiting the magical loot quantity and quality. Also the loot properties intensities are to low for the difficulty of the monster. Btw, I'm enjoying the new changes and looking forward to the doom content!