Medium aberration, neutral

Armor Class 12 (natural armor)
Hit Points 49 (9d8 + 9)
Speed 30 ft.

15 (+2) 13 (+1) 12 (+1) 8 (-1) 12 (+1) 12 (+1)

Skills Deception +3, Perception +3
Senses darkvision 60 ft., passive Perception 13
Languages Common, Deep Speech
Challenge 3 (700 XP)

Special Traits

  • Innate Spellcasting. The transposer’s innate spellcasting ability is Charisma (spell save DC 11, +3 to hit with spell attacks). It can innately cast alter self at will requiring no material components.
  • Transposition. An opponent hit by a transposer’s slam attack must make a DC 13 Constitution saving throw or become linked to the transposer. A transposer can have no more than 4 linked creatures at a time. While linked, the transposer knows the exact location of the target as long as it is on the same plane of existence. While the transposer remains linked to a target, any damage the transposer takes is halved, and each linked target takes an equal amount. If a transposer’s linked target regain hit points, the amount received by the target is halved, and the transposer regains an equal amount of hit points. A remove curse or dispel magic cast on the linked target can end the link. If dispel magic is cast on the transposer, one random link is severed. Otherwise the link lasts until the target dies or the transposer chooses to end the link.


  • Multiattack. The transposer makes two attacks with its slam.
  • Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) bludgeoning damage.


This creature looks like a featureless humanoid whose arms end in large sucker-like membranes. Transposers are thought to be of an alien culture; how they came to the Material Plane remains a mystery to sages. Most transposers avoid contact with sentient races, preferring to live in seclusion among their own kind.

When it first encounters potential prey, a transposer uses its innate ability to cast alter self to lure its target into its trap.

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