Mage Transformation (Būtsu Taimu; But's Grimoire) is a transformation that only Human can achieve after reading But's Grimoire.
In Yamcha's case; His hair grows as long to his waist resembling a Super Saiyan 3, and gains some extra muscles. Gains the ability to use magic, and is extremely powerful. He also gains a dark purple cape, a dark purple sash, and his equipped with a new Azure Dragon Sword.
In a similar fashion to the pre-revamp story - the user's appearance alters along with their clothes and even gain a melee weapon. However, unlike the pre-revamp story; the user gains dark purple irides, a purple aura, and their hair grows. Their muscle mass also increases in a similar fashion to the muscle mass gain from Super Saiyan 3. Any form they were including a "Masked" form will "peel" away.
In this form; the uses is capable of preform feats that they normally couldn't do under normal circumstances. Such as; match Super Shun Haru in battle, and produce powerful version of their attacks. The user's basic power increases by a multiplier of x120, and by further training they can increase the multiplier if higher.
Improvements and Advanced Levels
The Mage Transformation can be improved by vigorous training, and meditation. By improving Mage Transformation they are able to unlock an advanced referred to as the Supernatural State.