Migraine

From the Super Mario Wiki

Migraine is a special attack used by the monsters Cluster and Pulsar in Super Mario RPG: Legend of the Seven Stars. When they are encountered in a battle and attacked with a weak attack and not a sufficient one that defeats them, either one will use it. When used, a Cluster or Pulsar uses Migraine, it will float towards one of your party members, rise to the top of the screen and explode, scattering stars everywhere, followed by one of them being instantly KOed or heavily damaged.