I 3 box with mercs due to hand disabilities, both hands. A nerve issue. I cannot group due to my slower play. So I 3 box. I thought that it would be fun to report on rare nameds like this from a barely average 3 box..
113 SK tank, 113 Ench, 115 Druid. 2 rogue mercs with lotsa AA's. Cler merc with all AA's.
Kar'zok Grave Robber has a ton of HP like everyone else has said. He hits like a truck when he uses his abilities on tank. Every ability also seems to do an aoe mana drain.
SK had to use every defensive AA and disc to mitigate the heavy damage but was overall quite easy with 2 healers.
When rare died, druid was at 10% mana. Cler merc wat as 50% mana.
Pretty easy fight. Tank got low on health a couple of times..