Musk Ox

The musk oxen are covered in thick brown hair and are armed with a heavy pair of sharp, curving horns.
Like most fauna, the musk ox of the northern lands are large and fierce variety. It stands about 5-1/2 feet high at the shoulder, and weighs more than 1,200 pounds.
Musk oxen tend to be shy creatures, but the musk ox is noted for its foul temper and sheer fighting instinct. Once a foe catches its attention, the musk ox does its level best to batter it to death with repeated charges and then stamp what’s left into bloody mire in the snow. They are especially aggressive when calves are present.

Musk Ox CR: 1 (200 XP)

Large beast, unaligned

Armor Class: 14 (natural armor)

Hit Points: 38 (4d10 +16)

Speed: 35 ft

STR

14 +2

DEX

11 +0

CON

18 +4

INT

2 -4

WIS

17 +3

CHA

3 -4

Skills: Athletics +3, Perception +7

Damage Resistances: Cold

Senses: passive Perception 17

Challenge Rating: 1 (200 XP)

Stubborn. The musk ox has advantage on saving throws against being charmed. Upon succeeding its saving throw, it is immune to being charmed by that creature for the next 24 hours.
Aggressive. The musk ox can use its bonus action to move up to its movement speed towards a hostile creature
Charge. If the musk ox moves at least 20ft. straight toward a creature and then hits it with a gore attack, the target takes an additional 7(2d6) damage.

Actions

Gore. Melee Weapon Attack, +4 to hit , 5ft., one target. Hit: 10 (2d6+3) piercing damage. If the target is a creature, it must succeed a DC 12 Strength saving throw or be knocked prone. The buffalo can use its bonus action to gore a prone creature.