The Steel Tigers are a Fifth Founding Chapter, noted for their extreme divergence from the Codex Astartes, who were intended to perform the role of the Imperium's Rapier. Intended to be the pinnacle of Imperial shock troops, they trace their lineage back to Sanguinius. Among Blood Angels successor Chapters, the Steel Tigers are known for a disproportionate occurrence of the Black Rage, comparable to their brothers, the Flesh Tearers. In many ways, this has resulted in the Steel Tigers being confused for a Cursed Founding Chapter, alongside the likes of the Sons of Antaeus and the Legion of the Damned.