Hey all.
This involves the quest Destroying the Altars. If you've already done this quest then you are out of luck because the mobs phase out when you turn in the quest.
Basically this area is full of undead, and they only have 3,780 hitpoints each! They don't have any loot, but they always drop coin, and they repop after a minute. Only thing you have to watch out for is Master Summoner Zarod, who's a typical level 80 caster.
I did a forum search and all I found regarding this quest was that you could destroy the altars while mounted and stealthed. If this was already posted, my apologies.
Happy Farming!