Rozalin's Combo Skill with Seraphina, "Love Revelation".
Combo Skills are a type of skill available in Disgaea 5: Alliance of Vengeance. They are all unlocked at the beginning of Episode 9, having no level requirement to be learned.
Each Combo Skill has designated helpers(usually just one), and they can only be used if said helpers are in one of the 8 panels surrounding the owner of the skill. The strength of the effect depends only on the stats of the owner, but EXP/Mana/Class Proficiency gained will still be split amongst all participants. Like with Team Attacks, enabling a Combo Skill doesn't spend the turn of a helper unit.