Epic Devil Assault! First try, 40 minutes, 3 deaths (2 in the first 15 seconds due to lag, 1 to end boss who hits HARD), about 4 majors used across the whole party.
I pulled a Large Scale, Large Stone and a Mysterious Artifact. Some others got boot ingredients, larges, a Shard of Power and an Astral Diamond.
Oh, and I have zero epic items and only a tier 2 greensteel on my barbarian (though both Numot and Sorg are positively dripping with goodies).
CC was key here (as I mentioned it would be earlier). Used disco ball, Symbol of Persuasion (latter waves gain immunity to this via Shavarath environmental effect), Mass Hold, Flesh to Stone and Stunning Fist from what I could see. Sorg's enchantment DC was something like 46, so take the effectiveness of the CC with a grain of salt, and maybe some humble pie.
Oh, and I gathered that the new songs from the Spellsinger played a large part in the low resource consumption, as both Sorg and Numot were joygasming over the songs fairly constantly.