Ultra Ego is a state achieved through God of Destruction training, fueled by passion and overwhelming emotions, encouraging users to move freely and take direct blows from opponents.
Ultra Ego brings out the user's instinctual, bloodthirsty, and ferocious side, as seen with Vegeta, who felt like his old battle-loving self when using the form.
Ultra Ego has drawbacks for those who haven't mastered it, such as increased vulnerability and the risk of blackouts by taking too many hits.
Vegeta learned Ultra Ego from Beerus during the Granolah the Survivor Saga and achieved the transformation during his battle with Granolah.
After Ultra Instinct, it was expected that Vegeta would unlock a new power. Dragon Ball Super introduces other transformations like Orange Piccolo and Gohan Beast.