Ruyi Jingu Bang

Ruyi Jingu Bang (如意金箍棒, Rúyì Jīngū Bàng; literally meaning "Ideal Golden-bound Cudgel") is a powerful staff handed down through the Wukong family that carries a powerful ability to change its size at the command of its wielder. The unique trait of the Ruyi Jingu Bang is that it only reacts to members of the Wukong family and it requires a user with strong spiritual power. The staff is monstrously heavy to everybody but Sun Wukong, having attached itself to his spiritual energy and made itself "a part of him".