Familiar-Possessed - Eria (DR04-EN087) - Dark Revelation Volume 4 Unlimited

By sending 1 "Eria the Water Charmer" and 1 WATER monster from your side of the field to the Graveyard, you can Special Summon this card from your hand or Deck. If you Special Summon this card in this way, this card gets the following effects: During battle between this attacking card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent's Life Points.