Nice one!
I just switched my Pally to DoS and even with 84ac the grazing hits add up, and they mobs still roll 20's.
To get the 5 runes lit up, use a thrower/bow to agro some archers on the big main platform and let them walk through the North, Middle, South runes. Kill them then jump to the West rune. Haste and jump back to the main platform (or run along the bottom if you don't make it) and hit the East rune once you come back up.