Gulper Behemoth

Gulper Behemoth is a gargantuan monstrosity (Challenge Rating 9).

**AC:** 16 **HP:** 188 **Speed:** [object Object] **STR:** 20 **DEX:** 10 **CON:** 19 **INT:** 4 **WIS:** 10 **CHA:** 5 The titanic eel-like creature has delicately dancing frills and flickers of phosphorescence just under its translucent skin. Its mouth opens impossibly wide as it surges forward._ **Deep Sea Lure.** The gulper behemoth lives in the waters of the remotest oceans. It lures sea dwellers to their deaths with dancing motes of light within its massive, ballooning gullet. Rumors abound that even a sharp pinprick will deflate the sea monster. ## Gulper Behemoth’s Lair The gulper’s lair is filled with brightly-colored and labyrinthine giant corals. Smaller, mutualistic predators swim throughout the lair, keeping it well protected. ### Lair Actions On initiative count 20 (losing initiative ties), the gulper behemoth takes a lair action to cause one of the following effects; the gulper behemoth can’t use the same effect two rounds in a row: * The gulper behemoth commands deep sea eels and plants to constrict a target it can see within 60 feet of it. The target must succeed on a DC 15 Strength saving throw or be restrained until initiative count 20 on the next round. * The gulper behemoth commands plants and coral to shoot boiling water at up to three creatures it can see within 60 feet of it. Each target must make a DC 15 Constitution saving throw, taking 10 (3d6) fire damage on a failed save, or half as much damage on a successful one. Being underwater doesn’t grant resistance against this damage.

Mechanics

ac:
16
cr:
9
hp:
188
cha:
5
con:
19
dex:
10
int:
4
str:
20
wis:
10
size:
Gargantuan
type:
Monstrosity
speed:
[object Object]

Related entries

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6 same-category · 0 cross-category

Sources

  • Tome of Beasts 2·OGL-1.0a·© Tome of Beasts 2. OGL-1.0a. Via Open5e (open5e.com).
Last updated 6/19/2026·Tags: monster, monstrosity, gargantuan