I know it's not the most reliable artifact in the world, but the Glowy Howzit can potentially be amazing. In one game it managed to deflect 12+ mortal wounds. Of course, you never know when you'll roll that 1, but hell, a 4+ after save is nothing to dismiss. I've found you want to make your Troggboss tougher, rather than killier. He's better as a big, decent support beatstick, and he's fairly squishy without some protection. He probably doesn't gain as much from offensive artifacts.