Boros starts in his armour, Garou starts in Monster form.
Hero Association roster: Tatsumaki, Bang, Superalloy Darkshine, Pig God, Child Emperor, Metal Bat, Zombieman, Genos, Metal Knight, Atomic Samurai, Lightspeed Flash, King (with reputation), Tanktop Master, Puri-Puri Prisoner, Sweet Mask.
Monster Association roster: Orochi, Psykos, Black Sperm (can go Multi-Cell and Golden), Overgrown Rover, Fuhrer Ugly, Homeless Emperor, Evil Natural Water, Gums, Elder Centipede, Awakened Cocroach, Face Ripper, Pureblood, Phoenix Man, Gouketsu.
House of Evolution roster: Asura Rhino, Beast King, Mosquito Girl, Armored Gorilla.
Everyone is in-character. Fight takes place in the same area where Garou wrecked everyone and fought Saitama. Obviously, feats from all official media are allowed for all.
Will the combined power of Associations and HoE be enough to overpower the Dominator of the Universe and the Human Monster, or will their superior numbers not stop them from being overwhelmed?