Born from dead Transformers infused with Dark Energon, the Terrorcons are Megatron's greatest asset—an undead army under his thrall. Each is powerful and relentless in its own right; en masse, their persistence and Dark Energon they radiate can sap the strength of their Autobot prey until they can pull it down and tear it apart. Thankfully, they are not invulnerable. Energy blasts of sufficient force can deter them, though the best method is to use bladed weapons to slice them to pieces—the smaller the better—as the Dark Energon charge cannot sustain itself within the smaller, disparate components. Simply slicing them in half doesn't seem to be sufficient, though the method of irradiation may be a factor: The one case known to be prodigiously active despite total bisection was the product of a direct implantation of crystallized Dark Energon; all others to date have been created by absorbing energies emitted over a wide area by a shattered crystal.
While Terrorcons are called as Demons by Unicron at the final they are also considered as Angels due to Unicron acting as God of Earth.