 He successfully uses it to destroy the larger Gunmen and break through the ceiling to bring him and Kamina to the surface world.Simon and Kamina learn from Yoko that humans on the surface are attacked each day by Gunmen who are piloted by beastmen which are humanoid creatures who serve as Lordgenome's army.Kamina hijacks a Gunmen and names it Gurren, combining it with Lagann to form the mecha Gurren Lagann.