WARNING!!! PAGE MAY CONTAIN SPOILERS FOR THE ANIME DRAGON BALL SUPER!!! READ AT YOUR OWN RISK!!!
"My form is justice. And my form is the world. Worship me. Give praise unto me. Me, the beautiful, the sublime... Me, the invincible, the almighty and divine... All hail Zamasu." - Fused Zamasu upon his birth in Worship Me! Give Praise Unto Me! The Explosive Birth of a Merged Zamasu!
Fused Zamasu (合体ザマス, Gattai Zamasu, Lit. Union Zamasu) (known as Fusion Zamasu in the anime) usually just referred to as Zamasu (ザマス) and called God Zamas in the manga, was a fusion born of the union between Goku Black (Zamasu in Goku's body) and Future Zamasu through the Potara earrings. He is the final antagonist of the "Future" Trunks Saga.
In the manga version of Dragon Ball Super the proper Potara fusion between Future Zamasu and Goku Black wears off, due to neither of them being official Supreme Kais.