This creature stands at least twice as tall as a normal human. A large central bull-like head is ringed by eight snake-like heads, each spitting and hissing. Its entire body is covered in thick, metallic scales of coppery-green.

Thessalgorgon CR 11

XP 12,800
N Huge aberration
Init +4; Senses darkvision 60 ft., low-light vision, scent; Perception +17


AC 22, touch 8, flat-footed 22 +14 natural, –2 size)
hp 116 (8d10+72); fast healing 5
Fort +15; Ref +6; Will +7
Immune acid


Speed 40 ft.
Melee 8 serpentine bites +17 (2d6+11 plus 1d6 acid), bite +17 (2d6+11 plus 2d8 acid), gore +17 (2d8+11), 2 hooves +12 (2d6+5)
Space 15 ft.; Reach 10 ft.
Special Attacks breath weapon (60–foot cone, turn to stone, Fortitude DC 23 negates, usable every 1d4+1 rounds), spit acid (40 ft. line, 4d6 acid, Reflex DC 23 half, usable 1/day), trample (2d8+16, DC 25)


Str 32, Dex 10, Con 28, Int 2, Wis 16, Cha 9
Base Atk +8; CMB +21; CMD 31 (35 vs. trip)
Feats Combat ReflexesB, Improved Initiative, Iron Will, Power Attack, Skill Focus (Perception)
Skills Perception +17
SQ hydra traits


Breath Weapon (Su)

A thessalgorgon can use its breath weapon once every 1d4+1 rounds to create a 60–foot cone of green gas. Those caught in the area of the gas can attempt a DC 23 Fortitude save to resist the effects, but those who fail the save are immediately petrified. This petrification is temporary—each round, a petrified creature can attempt a new DC 23 Fortitude save to recover from the petrification as long as it is not caught within the area of effect of the thessalgorgon’s breath weapon a second time while petrified. A creature exposed to the thessalgorgon’s breath a second time while already petrified becomes permanently petrified, and can no longer attempt to make additional Fortitude saves to recover naturally. The save DC is Constitution-based.

Hydra Traits (Ex)

Though a thessalmonster cannot be killed by severing all of its serpentine heads, doing so prevents them from attacking and can assist in slaying its body. Any attack that is not an attempt to sever a head affects the body, including area attacks or attacks that cause piercing or bludgeoning damage. To sever a head, an opponent must make a sunder attempt with a slashing weapon targeting a head.

A head is considered a separate weapon with hardness 0 and hit points equal to the thessalmonster’s HD. To sever a head, an opponent must inflict enough damage to reduce the head’s hit points to 0 or less. Severing a head deals damage to the thessalmonster’s body equal to the thessalmonsters’s current HD. A thessalmonster can’t attack with a severed head, but takes no other penalties.

Editor’s Note

Base template: Thessalmonster (CR +3)


Environment temperate plains
Organization solitary
Treasure none

A typical thessalgorgon stands over 12 feet tall at the shoulder and measures 24 feet from snout to tail. It weighs about 8,000 pounds.

Thessalgorgons are a cross between a gorgon and a thessalhydra. They attack intruders on sight, attempting to trample, gore, or petrify them. There is no way to calm these furious creatures, and they are impossible to domesticate.

A thessalgorgon begins combat by charging at its opponents. It then bites relentlessly with all heads until its opponents are dead or flee.

Section 15: Copyright Notice

Thessalgorgon from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Scott Greene, based on original material by Gary Gygax and Wizards of the Coast.

scroll to top