Goomba idols

A GoomGod is a diety that appears only in Mario Party 8. Although the GoomGod has never actually been seen, its voice is heard when you reach its special tresure chest on a sacred island. The sacred island can be accesed by having your character land on a shiny, golden "Lucky Space" in Goomba's Booty Boardwalk. If you reach its special tresure chest, it will give you a Star and send you back to Start.

Species
Even though the GoomGod has never been seen, it is probably a sacred Goomba that lives in a fictional heaven. This is believed because of the large, grey Goomba statues and shrines that exist on the island.