Bomb-oom is an undead version of a Bomb-omb. They are formed after Bomb-ombs explode. They are similar to Bob-omb Buddies because they both can talk and operate things. But instead of operating regular cannons they operate cannons from the Underworld that can go back up to the Overworld. But they will only operate cannons for regular nice and gentle natured beings that have been accidentally transported to the Underworld and need to get back. They will not allow other ghosts to go or alive beings that deserve to rot away in the Underworld because of the bad deeds they have done up in the Overworld.