Cursed Rudolph

Cursed Glow : Rudolph's nose emits an eerie crimson light. Any creature within 5 feet of Rudolph must succeed on a DC 12 Wisdom saving throw or become frightened for 1 minute. the creature can repeat the saving throw at the end of each of its turns.

Chilling Hooves : On a successful hit with a melee attack, the target must succeed a DC 12 Constitution saving throw or take an additional (2d6) cold damage.

Undead Fortitude : if damage reduces Rudolph to 0 hit points, it must make a Constitution save of DC 5 + half of damage taken. (unless radiant or critical)
On success, Rudolph drops to 1 hp instead.

Antler Slam : Melee Weapon Attack: +6 to hit, Reach 5ft., one target. Hit: 11 (2d6+4) Bludgeoning damage.

Frost Breath (Recharge 5-6) : Rudolph exhales a 15-foot cone of icy air. Each creature in the area must make a DC 13 Constitution saving throw , taking 21(6d6) cold damage on a failed save, or half as much on a successful one.

Cursed Charge : Rudolph moves up to its speed in a straight line, during this it can make an Antler Slam attack against all creatures in its path.

Legendary Actions 

Rudolph can take 2 legendary actions from the options below. Only one legendary action option may be used at a time and only at the end of another creature's turn. Rudolph regains spent legendary actions at the start of it's next turn.

Hoof Stomp : Rudolph can make a Hoof Stomp attack against a creature within 5ft.
+6 to hit. (1d6)

Menacing Glare : Rudolph uses it's Cursed Glow, causing fear in a creature within 20ft that it can see. The affected creature makes a DC 12 Wisdom saving throw, or become Frightened for 1 minute, the creature can repeat the save at the end of each of it's turn.