Gall is capable of insane dps both hero and siege. Shadowflare is key to buff with its great range and high dmg with low cooldown. With great communication Cho can face a enemy head on and during the fight Gall can unleash Shadowfury and pretty much wreck any hero. The second Siphoning Rune and alil healing but when combined with the healing from Chos consuming fire it gives him that much more survival. Dread orb is a great move for dmging minions and heroes from a distance and even on their side of the wall :).