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The world contained a vital city-sized Promethium refinery, that the 33rd and 91st Mordian Iron Guard were deployed to defend. Though they are able to hold out for months against the Tyranids, the end came when a dying Bio-Titan sets off a cataclysmic chain reaction in the refinery. The resultant detonation obliterated the entirety of the 91st Iron Guard and the only survivors left of the 33rd Mordian, are those guarding the refinery's perimeter. These Guardsmen stubbornly held out until their ammunition reserves ran dry, at which point they were encircled and torn apart. The final fate of Phrixis itself is unknown.