The best way to counter Pierce in my opinion is not Valyndra's Aurium Plating, Ironbound or Golems. Granted those are some of the ways, and they may be the right way in certain situations, such as when reinforcements are unfavorable to small monsters or you must defend a key target from a blitz from the heroes.
However, far more often whenever you want to deal with pierce, or high damage in general, I would agree with Whitewing in that you should use large numbers of smaller monsters .Don't even worry about their weaker defense pool. All the piercing in the world isn't going to help them kill these much faster, as they are likely to die in one hit with or without the piercing and much of that just goes to waste.
Goblin Archers are awesomesauce, but Skeleton Archers are excellent too when the Goblins aren't available. The master Skeleton Archer cares not for the heroes' puny 7 damage with Pierce 4. He will tank that like a champ, and then if you shoot him again he is still coming back as a Minion ready to pop them in the face along with his 4 buddies!
Sorcerers are sweet for this too.
My complaints about Treasure Hunters don't come from Pierce or Logan Lashley's synergy with it, but from the class' ability to amass tons of treasure chests and high value search cards for the party without even a significant action penalty. And it just gets compounded on if you play with normal Rumor rules. Zachareth laughs in the face of this of course.. but then you're stuck with Baron Z all the time. Boo. He may a godly lieutenant, but he's kinda boring.
Whitewing and I disagree on how overpowering the TH is in this regard, but I think we do agree that stacking pierce, while annoying, is hardly undefeatable. Adjust your strategies and I believe you'll be fine.
Edited by Charmy