The Energon Pub

Forget the matrix this is a final showdown between Unicron and Primus which one emerges victoriously? You decide

Unicron, he's already killed Primus in Edge of "Extinction". But then again, Primus got back at Unicron in the Omega point story.

Primus has COLLOSSAL GUNZ so he wins. However, the incredible heat of the GUNZ would destroy a lot of Transformers living on his surface (Cybertron). He would have to make replacements afterwards.