Glen Korr is a Norm invoker who uses nature life force (pure) specialized in handling guns loaded with runes/spells that he generates.
He was called to fight against Demons due to this ability. He is fast, never reload (as long as he can speak), but should stay focused and concentrate on his spells. His gun has two mouths, one that eats the spells and the other that spits them under the shape of concentrated magic bullets.
He has magical bandages around his arm that allows him to hold/control the gun. The gun was a mana eater (small demon) that he enslaved/reshaped to use against his kind.