AllSpark

The AllSpark (オールスパーク, Ōrusupāku) is a physical object of mysterious origin and unimaginable power. A metallic artifact, it is inscribed with ornate runes, found on Cybertron, and is believed to be responsible for creating and sustaining life and was the source of the Transformer race itself.

For millions of years, Autobots and Decepticons have been waging the Great War over controlling it, with Optimus Prime and Alpha Trion making the choice to sent the AllSpark through a space bridge portal, keeping it safely out of evil hands and in effectively order to protect it from Megatron. If wielded by Decepticons, it would be a weapon of destruction like no other, as well as forging new armies into their ranks form various machines they would find.

It seems to have a will of its own, seeking out qualified bearers and uniting even unlikely allies into a team.

It can also unfold really purdy.

"Before time began, there was a mysterious artifact with unimaginable power. We do not know where it comes from, only that it holds the power to create life. That is how our race was born."
 * —Optimus Prime on the origins of his race.