Onikuma 鬼熊

Huge monstrosity (yokai), neutral evil

Armor Class 15 (natural armor)

Hit Points 136 (13d12 + 52)

Speed 40 ft., climb 30 ft.

STR 23 (+6) · DEX 12 (+1) · CON 19 (+4) · INT 6 (−2) · WIS 14 (+2) · CHA 10 (+0)

Saving Throws Str +9, Con +7

Skills Athletics +9, Perception +5, Stealth +4, Survival +5

Damage Resistances bludgeoning, piercing, and slashing from non-magical attacks

Condition Immunities frightened

Senses darkvision 60 ft., passive Perception 15

Languages understands Common and Sylvan but can’t speak

Challenge 8 (3,900 XP)

Traits

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

Demonic Toughness. The onikuma has advantage on saving throws against being charmed, frightened, or paralyzed.

Siege Monster. The onikuma deals double damage to objects and structures.

Boulder Master. The onikuma can lift, carry, and throw boulders weighing up to 4,000 pounds without being slowed.

Actions

Multiattack. The onikuma makes two attacks: one with its bite and one with its claws, or two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 6) piercing damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 6) slashing damage.

Boulder Throw. Ranged Weapon Attack: +9 to hit, range 60/240 ft., one target. Hit: 29 (4d10 + 6) bludgeoning damage. The target must succeed on a DC 17 Strength saving throw or be knocked prone. After the boulder lands, each creature within 5 feet of the impact point (other than the initial target) must succeed on a DC 15 Dexterity saving throw or take 14 (4d6) bludgeoning damage.

Bonus Actions

Rampage (Recharge 5–6). After the onikuma reduces a creature to 0 hit points with a melee attack on its turn, it can move up to half its speed and make one claw attack.

Reactions

Unyielding Bulk. When an effect would move the onikuma against its will, it can make a Strength saving throw against the effect’s DC. On a success, it isn’t moved.

Lore

A bear demon that walks upright and steals livestock from villages.

Onikuma, the “demon bear,” belongs to that class of animals which, once they reach an extreme age or size, cross over into the supernatural. Legend tells of an incident in the Kiso Valley of present-day Nagano Prefecture, where an abnormally large bear was killed: when its hide was stretched flat on the ground, it covered roughly 100 square feet (about 9.5 m²). The animal’s unusual size made the locals feel threatened, so they declared it not merely a rare specimen but a demonic creature capable of walking on two legs, shoving multi-ton boulders down into the valley, and at night hauling bulls and horses out of their stalls. Storytellers add that one such boulder, now called the “Onikuma Stone,” is still shown as tangible proof of the mythical predator’s strength.

Some records liken the Onikuma to a northern brown bear, yet the villagers view it as an entirely hostile force, and the only solution they recognize is to kill the beast outright.

From Yokai Bestiary 5E, Book Two, p. 76 · Fern Flower Press