thy ultimate spell

you summon a puppy, and then a kitty, and then a bunny, and then a rat, and then a fish, and then a bear, and then an owlbear, and then a t rex, and then a yeti, and then a girralon, and then a willowisp, and then a treant, and then a solar, and then an ice mephit, and then a tarrasque, and then a orca, and then a beholder, and then grazzt, and then a pit fiend, and then, a bard, and then a devourer, and then a loup garou, and then a keg robot, and then rak tulkhesh, and then a living blade of disaster. once they are  all summoned they attack everyone, including there fellow summoned monsters, the fighting persists for 1d100 rounds and then the wordnis destroyed. when the world is destroyed you gain all the xp from the creatures.