Some tips for this boss:

- Frost resist aura for the pally, shadow protection from the priest.
- The boss doesnt do any AoE, so stack your followers on the boss as well.
- AoE frost tombs down - consecration from pally and RoF from locks. If you're stacked on the boss, the AoE will also damage boss & skellies.
- Cleanse decrepify if cast on tank, ignore on the others (it's a str & movement debuff only)
- Pallies can DS out of frost tomb in emergencies - just remembet to cancel it straight away, becuase the boss will pound your alts while it's up.

Whats the gear/spec like on your toons? Can you link armories for them? This guy should be pretty easy for a level 74, so not sure why you're struggling without more info...

Cheers,
S.