Did you tried to kill the Dread Seeded Sand Demon?
I have managed to kill it with someone else. Also has anyone tried using the Tome again since it was rumored the Queen of Sands would actually come officially in 2.4? Also what about DF(Dread Fortress) and DP(Dread Palace)'s possible secret bosses? Severity Gaming did manage to kill the Hateful Entity, but it only dropped 4 Styrak masks which I believe aren't moddable.