Ice Walk. The spider 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.

Snow Camouflage. The spider has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.

Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the target must make a DC 11 Constitution saving throw, taking 7 (3d4) cold damage on a failed save, or half as much damage on a successful one.