Archangelic

An archangelic is a very rare small tree less than three feet high and which grows in extremely cold climates such as on the tops of the highest mountains. Its bark is sought after by herbalists because it serves as basis for a maceration which makes possible to resist the greatest cold.
A creature that absorbs an archangelic preparation gains cold resistance for 1 hour. The subject notices the end of the effects by a gradual return of the sensation of cold.