Killbane has the same bio-defence abilities as Gooseman, but also has the ability to blow poison gas from glands in his mouth, much like a lizard or snake can release venom. Due to the Wolf Den incident, Killbane's biodefences have become more powerful, and can activate in mere seconds rather than minutes as before.
Ryker Killbane has become twisted by the genetic enhancer and has focussed all his rage and anger on Shane Gooseman, whom he perceives as the enemy. This is both due to the rivalry they both participated in during their time at Wolf Den and the fact that Gooseman was always being 'coddled' by Walsh, and given somewhat preferential treatment.
Killbane is very self-centered, always thinking of himself before anybody else - a handover from the days at Wolf Den. In the encounters since the Wolf Den days, Killbane has tried to attack or disable Gooseman, the only one really capable of seriously injuring him outside of the other Supertroopers.