"Everybody had better watch out. He's the evil Saiyan "Cumber". His evil ki snaps the minds of whoever it touches."
Usage and Power
When used by an Evil Saiyan the user an aura which can be manipulated in order to create floating shadow hands. The Evil Saiyan aura can also be used to allow its user to grow a tail of shadow to replace their natural one, powering them up.
The Evil Aura also possesses the ability to corrupt good Saiyans, forcefully transforming them into the Super Saiyan (Berserk) or Super Saiyan God Super Saiyan (Berserk) state if they are overcome by it - as was the case of Goku and later Vegeta. Super Saiyan Blue Vegeta also struggled to fight back against this aura when the corrupted Goku hit him with it, leading the prince to believe that they may not be able to beat Cumber with strength alone. The aura does not have any negative effects on non-Saiyans like Cooler, and also did not appear to affect the half-Saiyan Future Trunks in any way, with him being able to block the corrupted Goku's Evil Aura attack without transforming. In order for a good Saiyan to avoid being affected by the aura, they must raise a barrier around themselves at all times.
As part of his plan involving the Universe Tree, Fu imprisoned Cumber within a device which would drain his Evil Aura for Fu's usage. Fu used the Evil Aura to berserkify Goku and Vegeta, but failed to do so against Vegito, who had used a barrier variant of his typical Blue form to prevent Cumber's aura from breaking through. In the Super Dragon Ball Heroes anime, Fu also powered up both Turles and Bojack through this aura to allow them to fight on par with Goku and Vegeta in their Super Saiyan Blue forms, and Towa used the Evil Aura to restrain the captured Time Patrol.