Basic: Two or more beings fuse into one being, with that one being being stronger than the individual beings combined.
Straight: Corey finds four feared ethereals named Star, Milky, Soleil, and Selene in order to defeat the Jerkass teacher at Runic academy. They then fuse into Starlight Twinkle who despite being girly, is able to invoke a Curb-Stomp Battle with the Jerkass Teacher.
Exaggerated: Eventually Corey does this several times, creating stronger monsters from weaker ones. He eventually plans to use these monsters to interfere with another villain' plan. The villain plans to use this spell on his men who are no longer of use to him and declares war against him.