Ice Walk. The dragon can move across and climb icy surfaces without needing to make an ability check. Additionally, difficult terrain composed of ice or snow doesn't cost it extra movement.

Petrifying Gaze. If a creature starts its turn within 30 feet of the dracolisk and the two of them can see each other, the dracolisk can force the creature to make a DC 15 Constitution saving throw if the dracolisk isn't incapacitated. On a failed save, the creature magically begins to turn to stone and is restrained. It must repeat the saving throw at the end of its next turn. Once a success, the effect ends. On a failure, the creature is petrified until freed by the greater restoration or other magic.
     A creature that isn't surprised can avert its eyes to avoid the saving throw at the start of its turn. If it does so, it can't see the dracolisk until the start of its next turn, when it can avert its eyes again. If it looks at the dracolisk in the meantime, it must immediately make the save.

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 4 (1d8) cold damage plus 4 (1d8) poison damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Cold Breath (Recharge 5–6). The dragon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 15 Constitution saving throw, taking 45 (10d8) cold damage on a failed save, or half as much damage on a successful one.