Arctic Aura

3rd-level transmutation
Spell List: Druid, Sorcerer, Warlock, Wizard
Casting Time: 1 action
Range: Self (20 foot radius)
Components: V, S
Duration: Concentration, up to 1 minute

For the duration you unleash a freezing aura. Creatures that start their turn within 20 feet of you must succeed a Constitution saving throw, or take 2d8 cold damage and have their speed reduced to 0 until the start of their next turn. Creatures that succeed their saving throw take half as much damage and their speed is reduced by half.

As a bonus action on each of your turns for the duration of the spell, you can actively control the aura, excluding a number of creatures in the area up to your spellcasting modifier from the effect of the spell until the end of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.