With a quick prayer, you wrap yourself in bitter cold which radiates from you in an aura with a 30-foot radius, inuring friendly creatures to low temperatures. Until the spell ends, the aura moves with you, centered on you. While in the aura, each nonhostile creature in the aura (including you) makes saving throws against spells and effects that do cold damage with advantage. In addition, an affected creature deals an extra 1d4 cold damage when it hits with a weapon attack.