Alchemy => do you have all 7 plants? Is the alchemy char the leading one during this procedure?
Shaman => I did in sneak and run tactic. Do you have the Shaman Magic "hammer" spell to stun him, so he can't heal?
Sneak up in single mode, until I see his red cross on the mini map and can target him with mouse, CTRL - splitting arrows - change my location with a few steps - then rinse and repeat.
