Well, it has to be relevant to the spirit held in it. What you probably mean is how generic can said spirit's powers be, right?
> Can you have a hunting fetish, a fire spirit fetish, a combat
fetish etc, or
> are they supposed to be similar to magical feats?
You could possibly have a spirit in a fetish to do any of the above, but not while I'm Narrating :) Spirits should have areas of effect like Feats, EXCEPT for Passion Spirits, which WOULD be like those you describe.
On the other hand, if you do mean the fetish itself, how specific it has to be to hold a given spirit is up to your Narrator. You could have a hunting fetish, which could hold a Sneaky Approach spirit, a Wait For Hours spirit, a Keen Senses spirit, etc. (one of them!).
Wulf
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