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Gargantuan fiend, chaotic evil


Armor Class 18 (natural armor)
Hit Points 332 (19d20 + 133)
Speed 40 ft., swim 40 ft.


STR 26 (+8)DEX 14 (+2)CON 24 (+7)INT 20 (+5)WIS 20 (+5)CHA 21 (+5)


Skills Arcana +12, Perception +19, Survival +12
Damage Resistances cold, fire, lightning
Damage Immunities poison; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, exhaustion, frightened, poisoned
Senses darkvision 60 ft., truesight 120 ft., passive Perception 29
Languages All, telepathy 120 ft.
Challenge 23 (50,000 XP)


Amphibious. Tsathogga can breathe both air and water.

Innate Spellcasting. Tsathogga's spellcasting ability is Charisma (spell save DC 20; +12 to hit with spell attacks). Tsathogga can innately cast the following spells, requiring no material components.

At will: acid splash, detect magic
3/day each: cloudkill (17th level), conjure animals (17th level; giant frogs or toads only), contagion (filth fever, flesh rot, or slimy doom only), dispel magic, fear
1/day each: blight, teleport

Legendary Resistance (3/Day). If Tsathogga fails a saving throw, he can choose to succeed instead.

Magic Resistance. Tsathogga has advantage on saving throws against spells and other magical effects.

Magic Weapons. Tsathogga's weapon attacks are magical.

Standing Leap. Tsathogga's long jump is up to 40 feet and his high jump is up to 20 feet, with or without a running start.


Multiattack. Tsathogga makes three attacks: one with his bite and two with his claws.

Bite. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 26 (4d8 + 8) piercing damage plus 18 (4d8) acid damage.

Claw. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 22 (4d6 + 8) slashing damage plus 9 (2d8) acid damage.

Swallow. Tsathogga makes one bite attack against a Large or smaller creature he is grappling. If the attack hits, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and effects outside Tsathogga and it takes 54 (12d8) acid damage at the start of each of Tsathogga's turns. Tsathogga can have only three targets swallowed at a time.

If Tsathogga takes 50 damage or more on a single turn from a creature inside it, Tsathogga must succeed on a DC 17 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the Tsathogga. If Tsathogga dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.


Tsathogga can take three legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Tsathogga regains spent legendary actions at the start of his turn.

Attack. Tsathogga makes one bite attack.

Cloudkill. Tsathogga casts cloudkill (17th level).

Blasphemous Croak (Costs 2 Actions). Tsathogga unleashes an unholy croak. All non-evil creatures within 40 feet that hear it must make a DC 17 Constitution saving throw. A target takes 52 (8d12) necrotic damage on a failed save, or half as much damage on a successful save. Additionally, a target that fails its save is stunned. The target can make another Constitution save, ending the stunned effect on itself on a success.

Tsathogga appears to be a gigantic frog no less than 60 feet long. His body is covered in warts and sores, and all ooze a putrid, yellowish mucus. His eyes are red and glow with an inherent evil. The creature’s massive mouth sports rows of sharpened teeth, each at least as long as a sword.

This foul frog-demon cares less about the machinations of men and power than he does about obliterating light and life with the slow oozing sickness and decay that he represents. He is the viscous dark evil bubbling up from beneath the surface, the foul corruption at the heart of the earth. Tsathogga makes his home on both Tarterus and the Abyss, spending equal amounts of time in both places. His lair is a vast swamp of filth deposited by the River Styx as it flows between the two planes.

Tsathogga’s main form is of a colossally-bloated frog with spindly, elongated limbs and fingers. His corpulent body exudes all manner of foul oils and fluids, which leak into the vile swamp in which he lies. He has positioned himself so that all of the slime and filth from the River Styx feeds into his gaping, toothy maw. He rarely moves and rarely speaks other than to emit an unintelligible shrieking. Tsathogga thoughtlessly commands a host of evil creatures, notably his own vile frog race, the tsathar.







Open Game License