Emperor's Basilisks

The Emperor's Basilisks were a space marine chapter of unknown founding and origin. While at first the chapter had a rather heroic history, there fate was ultimately sealed within their own flesh and blood, as the chapter was known to be prone to psychic mutations within their ranks. As such, the chapter was eventually purged by the Inquisition, with the only survivor of the chapter being the Chaos Sorcerer Amanu Ensis.