Heya Chud, having probs with shaman, are we? <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> He's not that tough; I dispatched him so fast and easy, that I was disappointed with how weak he was. Of course, since I was clearing out the bf dungeons, I was level 21 at the time. Poor shaman didn't stand a chance. <img src="/ubbthreads/images/graemlins/ROFL.gif" alt="" />
My warrior simply used a 1h sword and a shield, and I kept my DK archer in sneak mode just out of shaman's area spell effects, so he could shoot arrow after arrow without his attacks getting interrupted. I think that I had the DK using either power or spiritual arrows(or were they ethereal arrows?), but then again my memory's not what it used to be. <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />
Anyway, try positioning your skelly archer and your wizard in sneak mode away from the shaman and his spell attacks, so that they can shoot arrows and spells at him without being interrupted. Have your DK melee with the shaman. Is your DK having a problem hitting shaman? If he is, you will need to increase his agility and or proficiency with his weapon.
If you need further help, let us know.
Good luck!