You invoke the tenets of the heavenly dragon, Bakuryo, rewarding those who struggle and punishing the dishonourable. A freezing storm radiates from you in an aura with a 20-foot radius, covering allies in icy armour and freezing foes. The aura lasts for the duration, and it moves with you, centred on you.   When you cast this spell, and when a creature you can see enters the area for the first time on its turn, you must decide whether you wish to bless the creature. If you do so, the creature gains a +2 bonus to its AC while in the aura. Once you bless a creature, it remains blessed until the spell ends.   If you choose not to bless the creature, it must make a Constitution saving throw. On a failure, it takes 4d8 cold damage and its speed is reduced to 0 feet while in the aura. On a success, it takes half as much damage and its speed is halved while in the aura.