Solus Prime

History
The Thirteen Primes were the first Cybertronians ever made. They all lived together with the three artifacts. It was Solus Prime who was their blacksmith and forged the All Spark cube, the Matrix shell, and the Star Saber. She was a cunning warrior and an even better forger. Solus was one of the closest to Prima, their Prime leader. She even developed somewhat of a romance with him.

When The Fallen attacked, he tried to find the Forge of Solus Prime. This was the hammer Solus forged all three artifacts with and it was only possible to use it if you were indeed a Prime. Solus wouldn't give it to The Fallen which made him kill her.

It is even believed Solus Prime was the one who built the Key to Vector Sigma. But this has never been confirmed.