Plays the prelude to deal $240\%$ ATK DMG to the enemy unit with the lowest DEF, negates all Shields on the target, and applies [Offering] to them.After each cast, Inner Demon Tengen gains $1$ stack of [Return] for himself.Under [Nightmare], this skill turns into a dance that deals $2$ hits of $340\%$ ATK DMG to random targets.If a target's HP ratio drops below $20\%$ after casting, applies $1$ stack of [Vulnerability] to them.This skill triggers the currently held (Rhythm Melody) effect again.