By Mashable ME
The form is achieved when a Saiyan manages to gain full mental control while in the Golden Great Ape form.
Trunks took Super Saiyan II's power and multiplied it. Much like Goku's spirit bomb technique, Trunks was able to gather energy from the remaining humans in his time in order to defeat Future Zamasu.
Goku achieved this form through a ritual involving five other Saiyans who were pure of heart. Thus, a Saiyan has access to God Ki and their anatomy is irrevocably altered.
Goku and Vegeta are both able to achieve this form, where their gold colour is switched to blue. While its power is extremely draining on a Saiyan's body, they've both trained enough that they were able to outclass Frieza in his newly attained Golden Frieza form.
This form is exactly the same as Super Saiyan Blue, except for the fact that Zamasu is an actual God, not just a Saiyan who managed to gain access to God Ki.
Zamasu is the only person able to achieve this and can maintain his own skin tone and facial features with Goku's build and, more importantly, his hair.
Goku is calm and in perfect harmony with his mind and his muscles in this form
His power level gains a huge boost, though it is extremely damaging to his body. If he maintains the form for too long, his body could literally explode. But the form doesn't put Goku's power level above Jiren's.
Recognised as the power of the gods of destruction, this form is unique in that the sense that more damage the user takes, the more powerful they become.
Developed by Goku, he's the only one who can use this form. He does not reign in his emotions, and instead harnesses them to achieve ultimate power.