Nigellus was an early Chapter Master of the Crimson Sabres. Following the controversy surrounding the Chapter's behaviour in the Amalgamation Schism, Nigellus declared that the Crimson Sabres were to sever all ties with the greater Adeptus Astartes while still fighting for the Imperium. Beneath Nigellus’ stern leadership, the Crimson Sabres were zealous in their duty. In the pursuit of faultlessness, Nigellus instilled a new cult of extreme rigour within the Crimson Sabres. It was not enough for each mission to be successful; it had to be faultless, executed more swiftly, and properly detailed and recorded. It was a great loss to the Chapter when Nigellus was slain in action during the Fornstadt Rebellion.
- 1: Crimson Slaughter - A Codex: Chaos Space Marines Supplement (6th Edition) — Fall of the Crimson Sabres