Leech, Giant

Medium beast (aquatic), unaligned

Armor Class 11
Hit Points 26 (4d8 + 8)
Speed 5 ft., swim 20 ft.

11 (+0) 12 (+1) 14 (+2) 2 (-4) 10 (+0) 1 (-5)

Senses blindsight 30 ft., passive Perception 10
Challenge 1 (200 XP)

Special Traits

  • Vulnerability to Salt. A handful of salt burns a giant leech as if it were a flask of acid, causing 1d6 acid damage per use.


  • Blood Drain. Melee Weapon Attack: +3 to hit, reach 5 ft. one creature. Hit: 4 (1d6 + 1) piercing damage, and the leech attaches to the target. While attached, the leech doesn’t attack. Instead, at the start of the leech’s turns, the target loses 5 (1d8 + 1) hit points due to blood loss. The leech can detach itself by spending 5 feet of its movement. It does so after it drains 25 hit points of blood from the target or the target dies. A creature, including the target, can use its action to make a DC 10 Strength check to rip the leech off and make it detach.


A large, bloated leech floats in the muck and slime. These invertebrate parasitic relatives of the worm lurk in stagnant or slow-moving water, waiting for a suitable host. Giant leeches appear as larger versions of the common leech. A giant leech attacks any living creature that comes within 30 feet of it. There is a 50% chance that any leech encountered carries filth fever.

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

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