I don't know about this guy. You're paying 2 for an ally that's constantly in danger of getting killed, and once you're past the first cycle's swarms of bats and crows, there's not many things he can one-shot. He's in a strange place between disposable and important. It is enticing to build an elaborate system with Thalin, Spear of the Citadels and Honour Guards, but at that point you could just have a bunch of normal allies doing normal fighting. Always feels good when the enemy's last hit point happens to line up, though.