I just gave it quick run (dog decided he has to go out!).
Battlecleric, AC 47 half warded and half buffed. Summoned ancient water elemental.
AB 36 was enough to hit all creatures, even to land lots of crits.
AC 47 was sufficient without invis (been using elemental to tank half of enemies).
Spell regeneration + aura caused i missed only two kits (after succesfull sneaks from Mephit).
I used 10 charges of my breach wand to strip shields from margoyles. XPs were 6 + 13 on adventure mode on level 29: all I used are spells and powers availeble from early epic (xps would be higher).
When acid sheaths are done the only thing doing ANY dmg on water elemental were magma giants (and they do, a lot).
Loot is hilarious, yes, collected like 1300 gps and one golden amulet after 30 mins of fighting
WM with breach wand would have it even easier doing almost tripple dmg to me.