Generally, spirits are fairly friendly to Garou, at least ones that aren't automatically hostile to anything. That doesn't mean, however, that they treat a Garou exactly the same as they treat other spirits, and that's where this Gift comes in handy. By activating it within the Umbra, the Theurge disguises herself as a spirit (usually a wolf spirit) to all concerned. She still physically looks exactly like her lupus form, she simply gives the impression of a spirit rather than Garou. Some Theurge have also used the Gift to throw off pursuit by hiding in a pack of wolf spirits. A chameleon spirit teaches this Gift.
The player spends one Gnosis and rolls Appearance + Subterfuge (difficulty 6 if imitating a wolf spirit, difficulty 8 for anything else). Each success keeps the disguise in place for one hour. While sometimes imitating a spirit other than a wolf is useful, it should be noted that the character will still somehow be recognisable as themselves to those looking for them. Even though they will clearly not look like their Lupus form, someting about them will still give the game away. This Gift is obviously of little use outside the Umbra.