Mastered Super Saiyan 3

Mastered Super Saiyan 3 is the perfected version of the Super Saiyan 3 transformation. Incredibly hard to control and master, Mastered Super Saiyan 3 has huge benefits once contained correctly! After good usable of the Super Saiyan Blue transformation, Goku was able to limit his energy enough to sustain Super Saiyan 3 correctly, allowing him to utilize it with ease. Upon mastering it, Goku was also able to fuse it with god ki, creating Super Saiyan 3 Blue.

Power
When mastered, Super Saiyan 3 will multiply the Saiyan's power by x16 of SSJ2 instead of the initial x4. Goku's speed, strength, agility and stamina all flourished. Mastered Super Saiyan 3 Goku was able to contend against Super Saiyan Blue Vegeta in a sparring match, aswell as land a direct hit to Lord Beerus.

Super Saiyan Blue 3, on the other-hand, caused catastrophic damage to otherworld upon transformation in the mortal world. Due to Goku's god ki and spiritual energy, the Otherworld got the impact of the first transformation, shattering King Yemma and Snake Way. Super Saiyan Blue 3 is considered stronger than Ultra Instinct, but less agile.