The Evil Witch Minion is the dark version of Hex and one of Kaos’ minions. She is the last of three bosses at the end of the Creepy Citadel level. Evil Witch and the other two minions must be defeated in order to collect the Eternal Undead Source.
This dark version of Hex fires three deadly dark-matter bolts then summons a bone cage for protection as she flings explosive skulls at nearby Skylanders.
She is also mentioned briefly in Book of Elements: Life and Undead, tormenting a village by transforming its residents. Though Zook was out of ammo to attack her, he used his knowledge of the real Hex and used his cannon as a didgeridoo, driving her away with music the good counterpart despised.