DS sucks in these new expert dungeons as of right now. Mostly because we arent as overgeared for it as we were for expert in 2.x yet. I can spam DS for 1000 TP and invigorate and still only have taken out about 30-40% of the hoard's HP pool, then I'm effectively neutered for quite a while. I'd rather'd IDC/TTT with georskoguls thrown in the mix, otherwise you'll have nothing for the next round of adds. I'm hopeful they will scale Doom Spike's damage at some point or reduce it's TP cost, but if nerfing Holy/Flare is any indication, likely not.