Ultimate Super Saiyan (Pandalove93)

Ultimate Super Saiyan (also called Super Saiyan 5) is most powerful Super Saiyan form ever. In order to obtain this form, Saiyan must combine the energies of his Super Saiyan 4 and Super Saiyan Blue together.

Appearance:
This form is nearly identical to the Super Saiyan 4 form, the only main differences being that the hair, fur and irises are now cyanish in color (albeit the fur change to a slightly lighter color than the hair). Ultimate Super Saiyan boasts a vibrant, fiery, electric blue aura.

Power:
Ultimate Super Saiyan is like Super Saiyan 4 form combined with the power and crimson godly ki of a Super Saiyan God turned cyan blue, due to a mortal absorbing it.

With this transformation, Goku and Vegeta are able to fight with Beerus, and Goku defeat Xicor easily, even though he didn't kill him first.

Only bad thing is that form can't be handled more than half hours, and it consumes lot of energy.