Mini-Con Matrix

The Mini-Con Matrix was created by the Mini-Cons of Over-Run's universe who, unable to save themselves or their world from being destroyed by Unicron, merged their spark essences into an artifact which might give another universe hope for survival.

Dreamwave comics continuity
The Matrix was brought into this universe by Over-Run, a Mini-Con who had escaped the destruction of his own universe. Over-Run protected the Matrix from Unicron's heralds, eventually bringing it under the protection of the Autobots. In a mission to rescue Optimus Prime, who had been shunted into Over-Run's doomed reality, Over-Run used the Matrix to enhance Optimus Prime and Jetfire's power to a level which might give Unicron pause. In the final battle with Unicron, the Mini-Con essences within the Matrix were amplified by the living essences of the Armada universe's Mini-Cons to help destroy the planet-eater.