Aura of Frost

Cold energy from the northern tundra radiates from you, fortifying your allies within a 30ft radius. Until the spell ends, the radius moves with you, centered on you. Each non-hostile creature within the aura including you gains resistance to cold and fire damage, and at the beginning of their turn, they gain temporary hit points equal to your spellcasting modifier (minimum 1). These hit points fade when the spell ends.