Frigid Shield. The Cryo Abyss Mage is surrounded by a magical shield of ice. The shield has 15 hit points and is vulnerable to fire damage, resistant to lightning damage, and immune to all other damage not. If the Frigid Shield breaks, the Cryo Abyss Mage is Stunned until a new shield is reformed.
Innate Spellcasting. The Cryo Abyss Mage's innate spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). It can innately cast the following spells, requiring no components:
At will: Frostbite, Ray of Frost
Cold Reformation. If the Cryo Abyss Mage start's its turn without a Frigid Shield, they will start to reform it by creating a frozen aura. Until their next turn, creatures that start their turn or enter the aura must make a constitution saving throw against The Cryo Abyss Mage's spell save DC or take 2d8 cold damage and gain the effects of the Frostbite spell on a failure (half damage and no effect on a success). If the mage starts its turn with a frozen aura, the aura is consumed and the mage gains a new Frigid Shield.
Multicast. The Cryo Abyss Mage casts Ray of Frost on a creature. If it hits, The Mage may cast Frostbite on the affected creature as part of the same action.
Falling Ice. (Recharge 5–6) Ranged Attack: range 30 ft., 3 targets. Hit: 20 (4d8 + 3) Cold] damage. The Cryo Abyss Mage creates 3 Ice shards above creatures that it can see within 30 ft. Creatures make a Dexterity saving throw as the shards fall towards them, taking half damage on a success. The mage may target the same creature multiple times.
Blink. The Cryo Abyss mage teleports 15ft to a location that it can see.
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