Beomure

Devil Mimic’s Sight. Magical darkness doesn’t impede the beomure’s darkvison.

Monstrous Rejuvenation. A beomure that dies comes back to life with all its hit points in 1d4 days unless it is killed by a creature currently effected by the bless spell.

Snow Armor. The beomure gets 50 temporary hit points at the start of its encounter and after using the snow cover action, as long as it has these temporary hit points it also as a bonus +4 to its armor class.

Snowy Camouflage. When the beomure has its snow armor and is still it is indistinguishable from normal snow minus its sword horn.

Snow Swimmer. The beomure can use its swimming speed instead of its other movement methods in snow. 

Snow Cover. The beomure takes a round to recover itself in snow, while it does this it can’t do anything else, all weapon attacks against it have disadvantage, and it gains resistance to all damage types except fire.

Multiattack. The beomure makes one attack with its horn, two with its maw, three snow balls, and one with its tail.

Swordhorn swing. Melee Weapon Attack: +4 to hit, reach 10 ft., 1 target. Hit: 4d12 + 6 slashing damage and the target must make a DC 17 constitution save, on a fail, they become poisoned. 

Snowball. RangedWeapon Attack: +4 to hit, range 25/80 ft., 1 target. Hit: 3d8 + 5 cold damage, 4d6 + 5 fire damage, and 5d4 + 5 bludgeoning damage, and the target must make a DC 17 strength saving throw, on a fail they become restrained, on a success, they are knocked prone.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 3d10 + 2 piercing damage. 

Tail. Melee Weapon Attack: +4 to hit, reach 20 ft., 1 target. Hit: 4d12 + 5 bludgeoning damage and the target must succeed a DC 17 strength saving throw, or be knocked prone.

Burrowing Leap. If the beomure burrows/swims into an occupied space it can use a reaction to perform a sword swing attack and a bite attack.