A shaman isn't going to be much good at combat by themselves. They will have put their best stats in INT, POW, and CHA and so their STR, CON, SIZ and maybe DEX aren't going to be all that good. Obviously Spirit Walking and Spirit Binding are going to be maxed out, and assuming a couple of other "responsible member of the community" skills such as healing or instruction, shamans tend to end up fairly light on combat skills. As a dedicated magical class like a priest or sorceror, they should have some magical resources to call on in a fight. What are they, and what are some example use cases? While the sorceror would be casting Wrack and taking out five enemies in a single combat round, or Form/Set Metal on their armor to weld them into statues, or Dominate Pagan to make them all run away, what might a shaman be doing?