Crypolyn Kaptcher
From Townstons
Crypolyn Kaptcher is the first Hero you will encounter in Frump's Misfortune. He appears as a giant bug surrounded by various minions. He is released from behind his gate when the Fade Machine is destroyed.
Crypolyn appears to be immune to Shadow damage, but Ice and Fire worked well against him.
He used to drop good loot, but in Build 122 he does not even drop Champion loot.