Gohan Vegeta and Trunks tried something risky but possibly extremely rewarding this was the only way to take down this evil Goku and change him back. They all did a dance with a few tweeks they were successfully able to all fuse creating the warrior Truheta they thought the name didn't work but they had to have a name.
They immediately headed to Goku's power source and challenged him to a fight. Bam bam bam. Goku had proven no match in this form so he turned into a form he called saiyan darkness and used a divine darkness to pause Truheta and deal blows without moving. Truheta then launched an attack he called Burning Big Bang Kamehameha. Goku got struck and all you could here was a cracking sound which was Goku's power limit once again breaking but this was nothing compared to the final birst of power Truheta would have, within seconds and a bam bam bam across the whole earth Goku's dark curse was broken and now all that was left was to take down the demon.
Or so they thought