Dark Energon, also known as the Blood of Unicron, is one of the most powerful and the most dangerous form of Energon in the universe.  It comes as crystals as all forms of Energon do and glows purple.  When injected into a dead Cybertronian, it will bring that Cybertronian back from the dead as a mindless zombie, and when injected into a living Cybertronian, it will make that Cybertronian more powerful and give them control over the undead Cybertronian. In Transformers Prime, it was revealed that the Earth's mantle was not composed of magma, as science suggested, but instead of Dark Energon, as Unicron was the Earth's core.

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