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    Tanjueo 탄주어

    Gargantuan monstrosity, unaligned

    Armor Class 17 (natural armor)

    Hit Points 292 (15d20 + 105)

    Speed 20 ft., swim 60 ft.

    STR 26 (+8) · DEX 8 (−1) · CON 25 (+7) · INT 2 (−4) · WIS 12 (+1) · CHA 5 (−3)

    Saving Throws Con +12, Wis +7

    Skills Perception +7

    Damage Vulnerabilities thunder

    Damage Resistances cold

    Senses blindsight 120 ft. (see Echolocation), passive Perception 17

    Challenge 17 (18,000 XP)

    Traits

    Echolocation. The Tanjueo can’t use its blindsight while deafened.

    Amphibious. The Tanjueo can breathe both air and water.

    Sensitive to Noise. When the Tanjueo first takes thunder damage or hears a clearly ringing handheld bell within 60 feet, it must succeed on a DC 18 Wisdom saving throw or be frightened until the end of its next turn. While frightened in this way, it must use its movement to flee from the source of the sound and it can repeat the save at the end of each of its turns, ending the effect on a success.

    Boat-Gulper. The Tanjueo’s bite can target Huge or smaller objects (including water vehicles). If it swallows such an object, the object and its occupants are treated as swallowed creatures.

    Actions

    Multiattack. The Tanjueo makes two attacks, one of which can be a Bite.

    Bite. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 32 (4d10 + 8) piercing damage, and the target is grappled (escape DC 20). Until this grapple ends, the target is restrained and the Tanjueo can’t bite a different target.

    Swallow. The Tanjueo makes one Bite attack against a Large or smaller creature (or Huge or smaller object) it is grappling. On a hit, the target is swallowed and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the Tanjueo, and it takes 35 (6d6 acid + 4d6 fire) damage at the start of each of the Tanjueo’s turns.

    • If the Tanjueo takes 30 damage or more on a single turn from a creature inside it, it must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures and objects, which fall prone in spaces within 10 feet of the Tanjueo.

    Tail. Melee Weapon Attack: +12 to hit, reach 20 ft., one target. Hit: 28 (4d8 + 8) bludgeoning damage.

    Scalding Vomit (Recharge 5–6). The Tanjueo spews caustic steam in a 60-foot cone. Each creature in that area must make a DC 20 Constitution saving throw, taking 45 (10d8) fire damage on a failed save, or half as much damage on a successful one. A creature that fails this save loses all nonmagical hair, eyebrows, and similar body hair (cosmetic effect). The vomit expels any swallowed creatures and objects as if by the Swallow trait.

    Reactions

    Flinch. When the Tanjueo takes thunder damage, it can move up to half its swim speed without provoking opportunity attacks.

    Legendary Actions

    The Tanjueo can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The Tanjueo regains spent legendary actions at the start of its turn.

    Move. The Tanjueo swims up to half its swim speed.

    Tail Slam. The Tanjueo makes one Tail attack.

    Vomit Spray (Costs 2 Actions). The Tanjueo spews foul water in a 30-foot line that is 5 feet wide. Each creature in the line must make a DC 20 Dexterity saving throw, taking 14 (4d6) acid damage on a failed save, or half as much damage on a successful one. A creature that fails the save is blinded until the end of its next turn.

    Lore

    A huge fish capable of swallowing a boat with its passengers.

    The name “Tanjueo” (탄주어) literally translates to “the fish that swallows boats,” a title that points straight to the creature’s most terrifying trait—its ability to gulp down entire vessels with the crews still aboard. Historical records often compare Tanjueo to a whale, suggesting an anatomy similar to that of a real animal, though some eyewitnesses insist the monster dwarfs any known whale.

    Tanjueo’s most nightmarish feature is the scalding vapor it releases when it vomits up unwanted prey. The steam is so caustic it singes every hair off a person’s body, leaving the victim bald and badly burned. In one version of the story, a fisherman who escaped from its stomach lost all his hair because the beast’s gastric acid ate into his skin.

    From Korean Bestiary 5E, p. 94 · Fern Flower Press