You can summon an aura of magical energy around you once per day. This aura extends 15 feet and does 1d12 damage to all who enter.
Aka Oni: (Fire Damage)
Ao Oni: (Lightning Damage)
Shiro Oni: (Frost Damage)

For all damage done with this feature, you gain an additional 1d12 every few levels.
(Level 3: 2d12, Level 6: 3d12, Level 9: 4d12, Level 12: 5d12, Level 15: 6d12, Level 18: 7d12)