Mephisto

Decreases the current HP of the enemy with the best HP status (Boss excluded) by 10%, and attacks the enemy target to inflict damage that's proportionate to the reduced HP.

Absorbs all other allies' HP by 10% to attack all enemies dealing damage that's proportionate to the absorbed HP. Recovers the Attack Bar of all allies by 20% afterwards.

Soul Stealer (Passive)

AOEAnti-ReviveShield

No one except for the boss can be revived while you are on the battlefield. In addition, the damage you inflict on enemies will be increased by 20% each when an enemy or ally dies (accumulates up to 5 times). In addition, creates a shield equal to 20% of your MAX HP for 2 turns if you attack an enemy on your turn. [Automatic Effect]