Tassie Slipcast can be found in the hut with the potter's wheels in Gunnarsgrunn. Tassie is not a barbarian; she is from an unknown town and moved into the potters with a loan from the Dwarf Hammerspike Stoutbeard who is the leader of a gang and initially wanted to become a Druid.
She was in serious debt when she was approached by an adventurer who offered to help her out. The adventurer defeated Hammerspike's lackeys, who was forced to forget about Tassie's debt. Grateful that she did not have to risk losing her business any more, she taught them how to make pot lids.