Worst Middle Room for Mirrored Halls pure Faction Team Contest

I copied the Dwarven Gate, gave up after 15 minutes after Ancient Golem killed my third and last Mirror Queen…with Barrier and reflect, as were the others. Gem blows up barrier 1st, ok. True dmg kills troop, ok. Why does Golem still have barrier…unless I’m wrong. I’m probably wrong. Still as frustrated as…