Arcane Vortex is the Special Skill used by the Byron the Black, a Garnet Hero recruited in the Twilight Tavern.
Description:[]
Deals (105% ATK + 230) to a column of enemies with a 20% chance to stun for 2 turns.
Diabolical Assault+ (Joint Skill with the Blue Witch):
Deals (120% ATK + 350) to a column of enemies with a 25% chance to stun for 2 turns.