Keen Smell. The Yule Cat has advantage on Wisdom (Perception) checks that rely on smell.

Cold Resistance. The Yule Cat is resistant to Cold Damage and can not be charmed.

Claws. The Yule Cat can make 2 Claw Attacks per turn and 1 Bite. Or 1 Leaping Pounce.

Claw Attack. Melee Weapon Attack: +6 to hit, reach 5 ft., Hit: 12 (2d6 + 6) piercing damage. 

Bite Attack. Melee Weapon Attack. +6 to hit, reach 5 ft., Hit: 11 (1d10+6) piercing and 5 (1d10) necrotic.

Leaping Pounce. Ranged Weapon Attack: +6 to hit, range 15ft., single target. Hit: # (2d6 + 6) bludgeoning damage. Target hit must make STR Save DC14 to avoid being knocked prone. 

Ready Approach. Once as a reaction, the Yule Cat can swipe at a target with its claws, as the target enters the 5ft range.