Werewolves pulse with the Wyld's energy, of course, but all creatures with form and nature have something of the Weaver in them, or so the Glass Walkers argue. Upon learning this Gift, The Glass Walker reconciles these two sides of his being, and he can summon primal energy and mystical form at the same time.
A Garou with this Gift may use Rage and Gnosis in the same turn with no penalty. Doing so allows the Garou to use Rage actions to activate fetishes and use Gifts requiring Gnosis (provided that said Gift does not take a full turn to enact). What's more important is that it allows the Garou to take Rage actions in the same turn that he steps sideways, provided that the player rolls enough successes to get to or from the Umbra instantly. This Gift's effects are permanent.