Gift of the Spriggan (Rank 5)[]
The Fianna may grow to up to three times her usual size or shrink to the size of a small puppy. A faerie or a Chimerling teaches this Gift.
System[]
The player spends one Gnosis point and rolls Stamina + Primal-Urge (difficulty 8). The effects last for one hour per success or until the Garou cancels the Gift. If the Garou grows larger, she gains three Strength dice for every 100% increase in size (i.e. one that grows to the full 3 times gains 9 Strength). If she grows smaller, she retains her normal Traits, but she may sneak around unnoticed or masquerade as someone's pet.
Source: 3rd ed WWtA Corebook