Megatronus was one of the Thirteen Original Primes, the first Transformers created by Primus to battle together against the chaos bringer Unicron. Thanks to his love interest Solus Prime - who created a cosmic weapon called the Requiem Blaster capable of vanquishing Unicron - Megatronus was able to depower him, forcing him to temporarily but in a long-term period of time remain in stasis. As the Thirteen rested, Solus Prime was convinced that the Requiem Blaster should be destroyed, not to fall in wrong hands. On the other hand, Megatronus believed that the Blaster should be kept in order to assist the Primes in future sieges. The brief skirmish for possession of the Blaster resulted in its accidental activation, brutally murdering Solus and transforming her corpse into the Well of All Sparks. After the other Eleven considered this an unforgivable crime and banished Megatronus for that, they locked away the Requiem Blaster and built a tomb for Solus surrounded by a deep cave.