A Spirit Shaman can opt to take these alternative class features:
Spirit Walker: A spirit shaman may forsake their ability to directly harm spirits in order to become more sensitive to the world around them and travel as tracelessly as a spirit does.
Replaces: If you select this class feature, you do not gain Chastise Spirits or Weaken Spirits.
Benefit: You gain the Detect Spirits class feature at level 2 and Spirit's Journey class feature at level 15, instead of their normal levels. In addition, you gain the Trackless Step class feature at level 3. (See the druid class feature.)
Manifest Guide: A spirit shaman's guide may become more in tune with the world, gaining a physical form.
Replaces: If you select this class feature, you do not gain Spirit Guide, Follow the Guide or Guide Magic.
Benefit: You gain an Animal Companion (as a druid of your Spirit Shaman level).
Bestial Spirit Attuning: A spirit shaman can interact with once-living animals, and use his physical form to reflect them.
Replaces: If you select this class feature, you do not gain Blessing of the Spirits or Warding of the Spirits.
Benefit: You gain Wild Shape (as a druid of your Spirit Shaman level). You can only use this ability to take the forms of animals.