The Steel Heart is a Chaos Space Marine Renegade Chapter that was wiped out in 801.M41 when the Aeldari Craftworld Lugganath attacked their stronghold. This headquarters is known to have been located somewhere north of the Halo Stars in the Segmentum Obscurus. Nothing else is currently known about this Renegade Chapter in Imperial records.
The Steel Heart's warband colours are not currently described in Imperial records.
The Steel Heart's warband badge is not currently described in Imperial records.
- Warhammer 40,000: Battle Missions (5th Edition), pg. 33