Potential Unleashed (LOTSG)

Potential Unleashed is the result of a ritual created and used by the Old Kai in Universe-Z and the Grand Supreme Kai in Universe-K.

The two known recipients of the ritual required a notable amount of time in comparison to anyone before them, with Kaestos needing to go through the ritual for 19 hours and Gohan for 25, whereas the longest the Grand Supreme Kai/Elder Kai had to perform it before them was 2 hours.

Appearance
The power up doesn't change one's appearance to any great degree aside from spiking up the user's power; aside from this Gohan was noted to have a much higher confidence than before by Piccolo when he appeared to fight Super Buu.

The power boost can also cause highly Ki sensitive individuals to not recognize the user of this power boost, shown when Piccolo mistook Gohan for someone else when sensing his Ki.

Usage and Power
The power gained from the ritual varies from person to person, however, the two known users of it gained incredible amounts of power compared to their base state.

Kaestos became stronger than he was when using Super Saiyan 3 in addition to having no strain from energy expenditure, allowing him to defeat the Demonic Trio of Dabura ,Towa, and Mira, who were able to defeat him as a Super Saiyan 3.

Gohan became far stronger than he was while using Super Saiyan 2, and could dominate a foe as strong as Super Buu, who was able to match Super Saiyan 3 Gotenks, with Super Saiyan Gotenks considered equal to Super Saiyan 3 Goku. Gohan was also able to go toe to toe with Super Buu after he absorbed Super Saiyan 3 Gotenks and Super Namekian Piccolo, however, he still lost due to his opponent's variety of skills and using his victim's memories to play mind games on Gohan.

Further Powering Up
While the ritual does unlock one's full potential it is not a dead end, those who gain it can still increase their power and will actually have an augmented ability to reach their limit, far beyond those without this augmentation.

In addition race related transformations - such as Super Saiyan for Saiyans or Super Evolution for Frost Demons - are still usable, and generally have a more efficient variant of the normal versions.

For Saiyans, this boosted form is referred to as Ultimate Super Saiyan, which has the massive power boost of Super Saiyan 3 and insignificant energy drain of Mastered Super Saiyan.

Drawbacks
While this power up doesn't have any inherent weaknesses those that utilize it still require somewhat routine training to maintain their power.

Kaestos went from being able to defeat a Super Saiyan Vegeto level opponent in one hit, only using some of his Super Saiyan power in the process, to having difficulties against an android on the level of Androids 17 and 18 without transforming.