5th-level Conjuration

Casting Time: 1 action
Range: Self (20-foot radius)
Components: V, S, M (a snowflake made of mithral, worth at least 500 gp)
Duration: Concentration, up to 1 minute
Class: Bender (water), Cleric, Druid, Paladin, Warlock, Wizard
Sourcebook: Ryoko's Guide to the Yokai Realms

You invoke the tenets of the heavenly dragon, Bakuryō, 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 3d10 cold damage, and its speed is reduced to 0 feet while in the aura. A creature can repeat this save at the end of each of its turns. On a successful save, its speed is halved while in the aura.
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.