Dark Energon (ダークエネルゴン, Dāku Enerugon) is a powerful, corrupted version of energon which can be used as a violent weapon and explosive. As energon is the emanation of Primus, from which all Transformer power and supply is formed, Dark Energon is similarly the emanation of Unicron, released after his first battle with the thirteen original Transformers. Even the smallest particle of Dark Energon can corrupt any amount of regular energon.
The violet-glowing Dark Energon supercharges any Transformer who ingests it, making them stronger, faster, more powerful...and more aggressive. It turns pain into pleasure, rendering any blows inflicted on a user futile and heals their wounds as well. However, it also acts as a powerful narcotic, filling the user with thrilling, dark sensations and causing addiction. Dark Energon withdrawal turns the user into a raving brute desperate to do anything for more. If the craving is not satisfied, the user devolves to a beast-like state and eventually dies.
Those who imbibe Dark Energon have been seen to project it from their bodies for various destructive purposes, such as attacking enemies, overloading computers, and bringing machines under their control. When a user is killed, the energy acts like a sentient thing (a worrying aspect for a force originating from Unicron) and flies from their corpse to empower any other user nearby.
Pieces of Cybertron infected by Dark Energon tend to turn purple and explode upward into twisted, sharp spikes and growths of metal. Some Dark Energon wielders have even shown the ability to detonate a cluster of these spikes in order to produce a group of mechanical spider-like creatures, which swarm anything nearby.
A Cybertronian corpse injected with Dark Energon will reanimate itself as a feral zombie, intent on destroying all in its path. They are mostly mindless berserkers, but can be commanded by a living Cybertronian who has also been corrupted by the evil energy.