Mastery of Super Saiyan

Mastery of Super Saiyan (マースタリーオブスーパーサイヤ人 Māsutarī Obu Sūpā Saiya-jin) is an advanced mental state. King Kai taught both Goku and Gohan to calm the mind and emotions while in his Super Saiyan forms.

Overview
Users are able to calm their mind and emotions to the point that their facial expressions become as relaxed as their base form and allows the user to even combine Kaio-ken with any Super Saiyan form.

Usage
Goku: GT often utilizes this along with his Full-Powered Super Saiyan 4 form while Gohan uses this form with his Super Saiyan 4 allowing them to take on the Mastered Super Saiyan 4 form. Goku: GT also uses it with his Super Saiyan form or Super Saiyan 2 form.