Nyoi-bō

The Power Pole (如意棒, Nyoi-bō; lit. "Mind Stick") is a magical, length-changing staff that is owned and solely wielded by Son Gokū. According to Gokū, this ancient and legendary weapon can easily grow and shrink at Gokū's will which makes it very useful for Gokū on his combats against his far distanced enemies.

This weapon is according to Gokū extremely heavy as it weights over 8.5 metric tons which makes it impossible for everyone to wield this staf except for Gokū, who can wield the staff like it's just some regular tree stick.