Rank 4 Homid Gift
The werewolf can wrap himself in a thick, opaque sarcophagus-like epidermis, making him immobile but near-impervious to harm. This cocoon grants him immunity to fire, starvation, gas, high pressure, cold and similar environmental hazards. An insect or Weaver-spirit teaches this Gift.
System: The Garou spends on Gnosis point. While in the cocoon, the werewolf ignores any attacks which fail to do damage at least equal to her Stamina + Rituals, but attacks that pierce the cocoon destroy it. The cocoon lasts for one scene, after which it dissolves rapidly and evaporates. The player may extend the duration of the Gift spending more Gnosis points. Spending days in the cocoon is entirely possible, but the maximum duration is up to the Storyteller.
Source: Core book revised.