The Equalizers are a 14th founding successor chapter of Ultramarine stock. They were created to reclaim the long lost Leijon Sector, an area of space at the fringes of the Ultima Segmentum. The Leijon Sector had been ravaged by xenos pirates since the start of the Long Night, and the Equalizers would spend their first two centuries of existence battling to clean it of the alien filth that had polluted it. Since the day they claimed the ruined hive world of Equius Prime as their homeworld and founded their Fortress Monastery, they have maintained their vigil at the edge of the Imperium.