Solus Prime (Primax)

Solus Prime was one of the first original Thirteen Cybertronians, being accredited as the blacksmith of the Thirteen, as well as being the first female Cybertronian.

She was responsible for the creation of the Enigma of Combination, as well as the Requiem Blaster during the Thirteen's war against Unicron.

After her lover, Megatronus Prime, used the Requiem Blaster to defeat Unicron, she believed that the blaster should be destroyed to prevent it falling into the wrong hands. Megatronus disagreed, and the two fought over the weapon, causing Megatronus to accidentally kill her.

After Megatronus obtained the Requiem Blaster, Matrix of Leadership, and Enigma of Combination, Solus Prime was revived using the harnessed sparks of fallen Transformers from the Well of Sparks. After pleading with those around her to destroy the relics, she took matters into her own hands and destroyed the relics, as well as using the energy of deceased Sparks to drag herself and Megatronus into the well, killing the two of them permanently.