Mephiston is a veteran of the long war. Exactly how old no-one knows, but he's old enough to be either a Colchisian or born into a family of pureblood refugees. Mephiston himself has no memories of his childhood. Neither does he remember his training - or the Long War. His memories stretch back only a few years; he remembers Castor becoming Lord of the 10th, but not much more than that.

Mephiston is, however, one of the most learned men in the 10th when it comes to the Lore of the Word. The number of volumes of holy scripture that he remembers - and can cross-reference - is almost beyond counting.

Mephiston is also a capable combatant, but with certain limitation: As long as no tactics are involved he does fine. But anything more complex than shooting obvious targets or butchering people in melee is beyond him.

Served in the 5th Company with Katarn Colchis, until he was reassigned to the Cult of the Faceless.