The war between Unicron and Primus comes to its seeming end during a climactic battle in which one of the Thirteen, Megatronus Prime, who is afterwards known as The Fallen, betrays Primus and becomes an acolyte of Unicron. The battle ends when the Fallen and Unicron are sucked into a black hole and disappear. With Unicron gone, Primus enters an eons-long slumber, preventing Unicron from detecting him through the mental link the brothers share. Later, an event known as the Shrouding divided all Transformers universes and nullified multiversal singularities, so Primus and Unicron are now distinct in each universe they inhabit.