Dark Energon is a special kind of Energon from Transformers: Prime. It is called the blood of Unicron, and it can do what ordinary fuel cannot: make dead Transformers move again.
Where it comes from
In the story Unicron sleeps at Earth's core, and Dark Energon is his blood, which over millions of years seeped to the surface as purple crystals. Its deposits are extremely rare and dangerous.
How Megatron uses it
Megatron sees Dark Energon as a path to an unstoppable army: he reanimates fallen Transformers, who become mindless 'Terrorcons'. He even drives a shard of Dark Energon into his own chest to grow stronger — linking him to Unicron himself.
Why the idea matters
Dark Energon adds horror to Prime and shows how far Megatron will go to win. It also connects the everyday war over fuel with a cosmic threat waiting beneath the heroes' feet.
