Eel, Gulper

Large beast, unaligned

Armor Class 14 (natural armor)
Hit Points 112 (15d10 + 30)
Speed swim 50 ft.

17 (+3) 15 (+2) 14 (+2) 2 (-4) 12 (+1) 2 (-4)

Skills Perception +3, Stealth +4
Senses blindsight 60 ft., passive Perception 13
Challenge 3 (700 XP)

Special Traits

  • Keen Smell. The eel has advantage on Wisdom (Perception) checks that rely on smell.
  • Water Breathing. The eel can only breathe underwater.


  • Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 20 (5d6 + 3) piercing damage, and the target is grappled (escape DC 13). Until this grapple ends, the eel can bite only the grappled creature and has advantage on attack rolls to do so.
  • Swallow. The eel makes one bite attack against a Medium or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the eel, and it takes 10 (3d6) acid damage at the start of each of the eel’s turns. The eel can have only one target swallowed at a time. If the eel takes 25 damage or more on a single turn from the creature inside of it, the eel must succeed on a DC 12 Constitution saving throw at the end of that turn or regurgitate the swallowed creature, which falls prone in a space within 10 feet of the eel. If the eel dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.


This strange being of the depths appears to be little more than a large mouth, flaccid body and dangling tail which glows with an unnatural red light.

This larger version of its more common cousin makes its home in deep tropical and temperate waters well below 3,000 feet in depth. The gulper eel spends its life eating giant shrimp, and any other creatures which happen to arouse its senses.

Gulper eels spend most of their lives in the deepest and darkest parts of the oceans, rarely if ever venturing near the surface waters. Solitary creatures by nature, during mating season (colder months of the year), it is common to find a pair of these creatures dwelling together. During mating season, the female deposits her eggs (2-8) in the dirt and mass of plants on the ocean floor. Within two months the eggs hatch and the young swim free. Young are independent within 2 weeks after birth and venture out on their own shortly thereafter.

A gulper eel averages 10 feet in length but can grow to reach 30 feet or more. Its body is long, sleek, and black in color and its tail ends in a luminous organ. Its eyes are small for its body and close to its snout. It massive mouth is lined with rows of sharpened teeth.

Gulper eels attempt to bite their prey, holding it before swallowing it whole. Because a gulper eel can unhinge its jaw and stretch its stomach, it can swallow opponents larger than itself.

Section 15: Copyright Notice

Tome of Horrors © 2018, Frog God Games, LLC; Authors: Kevin Baase, Erica Balsley, John “Pexx” Barnhouse, Christopher Bishop, Casey Christofferson, Jim Collura, Andrea Costantini, Jayson ‘Rocky’ Gardner, Zach Glazar, Meghan Greene, Scott Greene, Lance Hawvermale, Travis Hawvermale, Ian S. Johnston, Bill Kenower, Patrick Lawinger, Rhiannon Louve, Ian McGarty, Edwin Nagy, James Patterson, Nathan Paul, Patrick N. Pilgrim, Clark Peterson, Anthony Pryor, Greg Ragland, Robert Schwalb, G. Scott Swift, Greg A. Vaughan, and Bill Webb