The hardest hitting pet with shard is Brick. I ran with a couple of tanks earlier and they were nice. One tank did high damage and stayed alive. The other was getting mollywapped by adds because he was a full pet build. I would still give fury the most potential, because you can do 2 big hits while the shard us up, but just in pure damage, brick is it. I will soon be leveling another Shard up for my battle tanking(esrth) I already have 2. One each for my earth and sorcery pet build dps. Not to turn this into a complaint post, but damn, Artifacts and allies need to be account bound.