From the Super Mario Wiki
Almighty Goomba is a deity that appears in Mario Party 8. Although he is never seen, his voice is heard when the player reaches his special treasure chest on a sacred island. The sacred island is accessed by having a character land on the Lucky Space in Goomba's Booty Boardwalk. If a character reaches the Almighty Goomba's special treasure chest, he gives the character a Star and send them back to the Lucky Space, telling them to take the Star and go away.