Ultimate Super Saiyan is the ultimate form of Super Saiyan. It is very powerful. Goten and Goku are the only ones to achieve it, since Gohan went Ultimate. This form grants the user 1,000X it's Power Level. But there is one downfall to the living, if you haven't completely mastered this form in 3 months, it puts a Major Strain on your body. The only way to master this form is to train in the form for 24 Hours. You can train in the Hyperbolic Time Chamber using this form and you'll unlock the forms that surpass this form.