Firewalkers on a Firebirds set is freakishly powerful due to extra fire damage and because you're always on the move anyway. I've literally run my way through like T6-7ish stuff without using any skills until I hit elites, killing everything in my path just from the damage my blazing path does. It's kinda funny to see mobs dying as they are trying to catch up to me and run through the blazing line of death I leave in my trail.