Nightshade. He drops Holiday items during holidays ( its obvious XD ) And he drops a banshee and i think a pet fairy. Nightshade may not be the best, but he is pretty good. During halloween, a boss in triton avenue, called baron drops GREAT stuff. Its mostly halloween stuff. but its only on halloween
It really depends. If you want to do it solo then probably Lord Nightshade. Not solo it depends on level. These may be hard on solo but not impossible. Zeus Sky Father for 30+, Poseidon Earth Shaker for 70+, and Hades the Unseen for 90+. But overall, the best boss to farm in Wizard City is Cronus.
Cole GoldenFlame, Level 37 Pyromancer "In Aquila" World: Marleybone Area: Counterweight West