Same goes for gwd stuff, a hardmode or normal mode kill will count. Any variation of the boss works, as it were. I'm waiting for my friend to finish studying so I can hide behind him while he pwns vorago D:
I'll probably end up going with that fc that does vorago masses, maybe theyll let me maul him too. Idk
Masses are alot messier, scales up difficultity and alot of blues which can kill you considering most noobs at it doesnt know to run away when targeted by red + blue