Human Berserker, Slime Pit
It's a bit awkward because the magic using monsters all have some form of debilitating abilities. I decided to farm Binlor and Taurog my way through, and was able to cluster a few high level monsters (lv 9 Meat Man, lv 8 Golem, along with the two bosses) together with WEYTWUT, and killed the four of them in sequence without exploring. It might not be efficient, but the feeling is definitely wonderous. Though to be fair with Yendor it's not really that big a challenge.
Secret Dungeon: