A question came to me during GenCon. In the Grazer scenario on the
Issaries website, the part is attacked by Unneki buzzard-worshippers.
When we were assaulted by the main body of the Unneki, my character
the shaman, journeyed into the Otherworld where she and her steed did
battle with a powerful spirit associated with the Unneki leader. I
defeated it in spirit combat and spent my Hero point to turn my
normal success into a Critical success; according to the rules, I can
now treat it as a spirit from my Tradition whenever I encounter it in
the future.
It also says that such a non-tradition spirit can only be bound into
a one-use fetish, but a Traditional spirit bound into a fetish is a
essentially incarnated into the item on a critical. Which is the case
with the buzzard spirit? Common sense would seem to indicate that it
is only a one-use item, since the spirit was non-Traditional at the
beginning of the combat.