The Arena
A massive, circular coliseum with shifting terrain: lava pits, icy zones, collapsing platforms, and a roaring crowd. A giant scoreboard displays “KILL OR BE KILLED” in flashing lights. There’s no time limit, no rules… except that Mr. AntTenna’s Game Show jingles occasionally interrupt to offer "bonus prizes" mid-fight.
Round Start
The combatants are dropped into the arena simultaneously.
Larry just stands there. He is Larry. That’s all.
Sans is already dodging attacks before they happen, making Charizard's first flamethrower look like it was aimed at thin air. Bidoof, confused, starts using HM moves on the nearest wall. It learns… nothing.
Regigigas lumbers slowly, taking five hours to do anything. Everyone ignores it for now, which is a grave mistake for later.
Shadow the Hedgehog instantly teleports around firing Chaos Spears, knocking Kris’s sword away. But in the stands, someone shouts “¡Hola papi!” and Shadow freezes mid-attack, completely distracted.
Denji pulls the cord on his head — VVRRRRRRMMMM! — Chainsaw Man enters the fray, diving at Eternal Knight Ouroboros. Ouroboros blocks with an ice wall and counters with a demon-summoned hydra that swallows Bidoof whole. (Bidoof is… fine. It’s just chilling in there.)
Mid Fight Chaos
Mr. AntTenna dramatically announces a “SURPRISE ROUND” and traps Kris and Charizard in giant capsules, forcing them to answer trivia questions. Kris ACTs their way out with “Glare,” intimidating AntTenna into letting them go. Charizard just breaks the capsule with brute force.
Sans manages to hit Ouroboros with a barrage of gaster blasters, but the knight’s potion of regeneration negates the damage. One small scratch would kill Sans, so he’s dancing around like his life depends on it… which it does.
Larry is still just Larry. Nobody attacks him, fearing some unknown hidden power. He sneezes once. The crowd gasps.
The Five Hour Mark
The ground shakes. Regigigas finally wakes up. It casually backhands Charizard into the stratosphere, punts Mr. AntTenna into a wall, and begins dragging the entire arena toward the ocean.
Denji and Shadow briefly team up to chainsaw and Chaos Blast its legs, but Regigigas is basically a moving mountain now.
Ouroboros summons a colossal fire elemental to fight it head-on. Kris uses “Banish” to try purifying the elemental, partially succeeding and weakening Regigigas’s ally.