Ed Cha
Community Supporter
I left the definition of spirits intentionally vague in order to avoid contradicting any possible updates on this subject in the SRD. Until there is a clearer delineation of what is defined as a spirit, I think it is up to each individual DM to decide.
Though I know that it can be irritating when a gaming book is vague like that, I think it also makes it more interesting as the PC does not know if he or she is confronting a spirit or something else entirely different. When a DM describes a creature that appears to be a spirit, there is a sense of fear and the shaman may not be certain if he or she can handle this being.
Anyhow, to help answer your question, I would give the following as examples of spirits:
allips, ghosts, water weirds, phantom steeds, certain air elementals, even night hags, etc.
Though I know that it can be irritating when a gaming book is vague like that, I think it also makes it more interesting as the PC does not know if he or she is confronting a spirit or something else entirely different. When a DM describes a creature that appears to be a spirit, there is a sense of fear and the shaman may not be certain if he or she can handle this being.
Anyhow, to help answer your question, I would give the following as examples of spirits:
allips, ghosts, water weirds, phantom steeds, certain air elementals, even night hags, etc.