From Halopedia, the Halo wiki
During the Insurrection, Hellas, along with the colony Fumirole, harbored insurrectionists who were known to utilize rumbledrugs in a vainglorious attempt to fight SPARTAN-IIs. Unencumbered by the body's normal safety limits, subjects were capable of feats of enormous strength, but the subsequent lack of control and mental instability together with the immediate physiological damage meant that users often died long before they ever laid hands on an actual Spartan.
List of appearances
- Halo: Evolutions - Essential Tales of the Halo Universe
- Midnight in the Heart of Midlothian (First mentioned)
- Halo Encyclopedia (2022 edition), page 51
- Halo: Evolutions - Essential Tales of the Halo Universe, "Midnight in the Heart of Midlothian", page 93