Torakoishi 虎子石

Huge construct (tsukumogami), neutral

Armor Class 20 (living rock)

Hit Points Immune to hit-point damage (see Immutable Bulk)

Speed 20 ft., hop 30 ft.

STR 22 (+6) · DEX 5 (−3) · CON 20 (+5) · INT 10 (+0) · WIS 16 (+3) · CHA 18 (+4)

Saving Throws Con +9, Wis +7, Cha +8

Skills Insight +7, Religion +4

Damage Immunities bludgeoning, piercing, slashing, acid, cold, fire, lightning, poison, psychic, thunder

Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned, prone, restrained

Senses blindsight 120 ft. (blind beyond this radius), passive Perception 13

Languages understands all it hears but never speaks; telepathy 120 ft. with creatures it defends

Challenge 10 (5,900 XP)

Traits

Immutable Bulk. Torakoishi can’t be banished, polymorphed, or moved by magic. Weapon and spell attacks deal no damage to it. It can be forced to shift only by the feature Weigh the Heart or by the purification ritual Gedatsu-no-Gi (see below).

Migawari Guardian. When a creature Torakoishi can sense within 60 feet would be hit by an attack, Torakoishi can use its reaction to teleport to an adjacent space and become the attack’s new target. If the attack still hits, it deals no damage (the stone bears the blow).

Weigh the Heart. A creature adjacent to Torakoishi can spend 1 minute concentrating on a single, selfless intention (DM’s discretion). At the end, that creature makes a DC 17 Charisma (Persuasion) check. On a success, Torakoishi becomes weightless and can be moved (speed 5 ft.) by that creature for the next hour; Torakoishi is friendly toward it for the same duration. On a failure, the creature gains one level of exhaustion, and Torakoishi is hostile toward it for 10 minutes. A creature that fails this check can’t attempt it again until it finishes a long rest.

Living Boulder. Torakoishi is normally motionless, but it can animate as a bonus action; while animated it can take actions, reactions, and legendary actions. It returns to an inert state (no actions) if it ends its turn without perceiving a threat to its ward or its shrine.

Actions

Slam. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.

Bounding Crush (Recharge 5–6). Torakoishi hops up to 20 feet and lands with thunderous impact. Each creature within 10 feet of the landing space must make a DC 17 Dexterity saving throw, taking 31 (7d8) bludgeoning damage and being knocked prone on a failure, or half damage on a success. Structures and objects in the area take double damage.

Reactions

Guardian Hop. When a hostile creature ends its turn within 30 feet of Torakoishi’s ward (creature or location chosen by the DM), Torakoishi may hop up to 15 feet toward that creature.

Legendary Actions

Torakoishi can take 2 legendary actions, choosing from the options below. Only one option can be used at a time and only at the end of another creature’s turn. Torakoishi regains spent legendary actions at the start of its turn.

Move. Torakoishi hops up to 10 ft.

Slam. Torakoishi makes one Slam attack.

Reverberating Boom (Costs 2 Actions). Each creature within 15 feet of Torakoishi must succeed on a DC 17 Constitution saving throw or be deafened and pushed 10 feet away.

Ritual Weakness—Gedatsu-No-Gi

Performing an hour-long purification rite with sanctified salt and scripture in a 10-foot radius around Torakoishi severs its immortal tether. If the ritual is completed uninterrupted while Torakoishi is inert, it loses Immutable Bulk for 24 hours and its hit-point total becomes 100. During that time it can be destroyed normally.

Lore

Huge stones with the legs and tail of a tiger.

Torakoishi (虎子石) translates literally as “Little-Tiger Stone.” Legend attributes its appearance to the goddess Benzaiten, who chose to aid a childless couple. In a dream she gave Yamashita Choze and his wife a tiny pebble that would serve the family as a talisman. Soon afterward a daughter, Tora, was born, and the stone grew along with the child until it became an imposing boulder. Years passed, and Tora Gozen became the beloved of Soga Juro Sukenari, one of the avenging brothers from the Tale of the Soga. According to the legend the two brothers pursued their father’s killer and at last took blood revenge. The climax comes when, during the chase, Tora’s stone—Torakoishi—mystically absorbed both an arrow and a sword-stroke aimed at her husband Juro. Folklore says that the chips left by those blows, known as the “Soga scars,” can still be seen on the boulder’s surface. From this episode comes its second name, the “Guardian Stone,” underscoring its chief role: shielding a worthy person from harm.

Physically the artifact looks like a large, irregular gray-black boulder, yet Edo-period artists—especially in Utagawa Yoshikazu’s prints—gave it zoomorphic features: a tiger’s head, four paws, and a tail, letting it hop about and startle travelers. That playful reading turned the local shrine object into a well-loved, harmless yokai. Folk belief grants Torakoishi the power to change its mass: to those whose intentions are pure, or who are bound by love and loyalty, it becomes unexpectedly light—light enough to move with one hand; to the greedy or impious it grows impossibly heavy. The effect acts as a magical test of an adventurer’s motives, manifesting the spirit that dwells inside the stone.

From Yokai Bestiary 5E, Book Two, p. 98 · Fern Flower Press