Chilling Mist.

While it is alive, the one-eyed shiver projects an aura of cold mist within 10 feet of itself. If the one-eyed shiver deals damage to a creature in this area, the creature also takes 5 (1d10) cold damage.

Spellcasting.

The one-eyed shiver is a 5th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). It knows the following sorcerer spells:

Cantrips (at will): chill touch, mage hand
1st level (4 slots): fog cloud, mage armor, thunderwave
2nd level (3 slots): mirror image, misty step
3rd level (2 slots): fear

Actions

Dagger.

Melee Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

Eye of Frost.

The one-eyed shiver casts ray of frost from its missing eye. If it hits, the target is also restrained. A target restrained in this way can end the condition by using an action, succeeding on a DC 13 Strength check.

One-Eyed Shiver