Dezzy's Closet
Savvy's Attic
Scarlet's Game Room
I know of 2 creatures that drop Brogans of Decrepitude. There could be more, I don't have the scoop on ALL the bosses out there yet. I been trying to get Savvy to do my work for me - uh, I mean HELP me, but I haven't had much luck yet.
Name
Location
Death Oni
Tree of Life, MooShu
Jade Oni
Emperor's Throne Room, MooShu