The Worm Peacemaker
There has been some concern and discussion regarding the worm in Pagoda. Simply put, worms cause pacifism. If a worm is in a space with another piece, that space cannot be attacked by humans or pushed by goats. When alone, they are as any other piece.
While a worm can move into a space with other pieces, other pieces cannot move into a space with a worm.
A goat cannot push back a goat that just pushed it. This avoids two goats pushing each other indefinitely, thus making an infinitely long game.