Alright, the bio is in its last rough draft.  Maybe tomorrow, if I have free time, I'll get it 100% complete.

He's basically a native of the Barren Flats, and when Cherwin invaded Broacien he was to sick to fight.  When he became healthy again, Warren worked for lord Jachsen in the Barren Flats, and eventually signed up with other mercenaries to back Gregar Barin when he took the throne.  He then fought for Gregar when the ibn-Wahad sultanate invaded.  Afterwards, he went on a merciless crusade in Redsand, where he butchered dozens of the sultanate's men, even pushing into the desert regions below Redsand to slaughter whole patrols.

I still need to reference why he hates the sultanate so much, other than they killed his brother, and I need to reference his deteriorating health, and also when he got injured.