The Splatoon 3 special weapon that creates a giant ball of ink that explodes is the Booyah Bomb.
The Booyah Bomb is a chargeable special weapon built around gathering ink into a large sphere. The player charges it while teammates can contribute by sending “Booyah!” signals, then throws the finished bomb toward a target. It detonates in a broad blast, damaging or splatting opponents and covering the surrounding area in the user’s ink color.
Its name comes from Splatoon’s team communication system: “Booyah!” is a positive call players can send during matches. The weapon therefore turns a cooperative signal into a high-impact attack, rewarding teammates who help charge it quickly.
The Booyah Bomb is not the same as Tenta Missiles, which lock onto multiple targets, or Ink Vac, which absorbs incoming ink attacks. Krak-On Roller is not a special weapon at all; it is a roller weapon variant. The “giant ball” description specifically points to the Booyah Bomb’s defining visual and explosive effect.