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Spawn of Yog-sothoth

Large aberration (alien, extraplanar, mythos), chaotic evil

Armor Class 17 (natural armor)
Hit Points 168 (12d10 + 48)
Speed 30 ft., climb 30 ft.

17 (+3) 8 (-1) 18 (+4) 6 (-2) 15 (+2) 8 (-1)

Saving Throws Con +8
Skills Perception +6
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities cold, fire
Condition Immunities blinded
Senses blindsight 500 ft. (blind beyond this radius), passive Perception 16
Languages Aklo, telepathy 1 mile
Challenge 11 (7,200 XP)

Special Traits

  • Devastation. When a spawn of Yog-Sothoth takes the Multiattack action against an object, it deals double damage to structures and Large or larger objects.
  • Legendary Resistance (2/Day). If the spawn of Yog-Sothoth fails a saving throw, it can choose to succeed instead.
  • Magic Weapons. A spawn of Yog-Sothoth�s weapon attacks are magical.
  • Nauseating Stench. A spawn of Yog-Sothoth exudes a hideous, unforgettable stench that nauseates living creatures within 30 feet for 1 minute unless the creature makes a DC 17 Constitution saving. Nauseated creatures are effectively paralyzed as they spend their turn retching. Creatures that successfully save are sickened and have -1d6 on all d20 rolls until the end of their next turn but cannot otherwise be affected by the same spawn�s nauseating stench for 24 hours. Any effect that cures or protects against poison works on nauseated or sickened creatures. Creatures with immunity to poison are unaffected, and creatures resistant to poison have advantage on the saving throw.
  • Regeneration. The spawn of Yog-Sothoth regains 10 hit points at the start of its turn. If the spawn takes radiant damage, this trait doesn�t function at the start of the spawn�s next turn. The spawn dies only if it starts its turn with 0 hit points and doesn�t regenerate.
  • Tenuous Natural Invisibility. The spawn of Yog-Sothoth is invisible, however, it shimmers when it attacks allowing it to more easily be located. No combat advantage or disadvantages related to invisibility are imposed when fighting a spawn though all attacks have a -1d2 to the attack rolls.


  • Multiattack. The spawn of Yog-Sothoth makes a bite attack and up to two tentacle attacks, or it makes up to four tentacle attacks.
  • Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 25 (4d10 + 3) piercing damage.
  • Tentacle. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage, and the target is grappled (escape DC 20) and is moved up to 5 feet toward the spawn of Yog-Sothoth. Until this grapple ends, the target is restrained, and the spawn can�t use this tentacle against other targets. The spawn has four tentacles.
  • Chronal Sink (Recharge 5-6). A spawn of Yog-Sothoth can emit a 30-foot-radius sphere that dislocates affected creatures from the shared timestream. Creatures that fail a DC 17 Wisdom saving throw are slowed (as per slow spell) for 1 minute or, if already slowed by this effect, paralyzed and frozen in place for the same duration. As these conditions result from a subjective time manipulation effect, spells such as freedom of movement do not negate them.
  • Iridescent Globes (Recharge 5-6). A spawn of Yog-Sothoth can emits five 1-foot-diameter iridescent globes that immediately fly to attack one or more creatures of the spawn�s choosing within 60 feet before disappearing. Each globe makes a +11 attack, if the attack lands the target is shunted forward in time 1d4 rounds. An affected creature immediately disappears and then reappears at the same location at the later time; for the affected creature, it�s as if no time passed. An affected creature can choose to resist being shifted forward in time, but the spacetime flux rips and tears at it. For each round the affected creature wishes to reduce from the duration it is shunted into the future, it takes 14 (4d6) psychic damage. The spheres persist until they land an attack.

Legendary Actions

The spawn of Yog-Sothoth can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature�s turn. The spawn regains spent legendary actions at the start of its turn.

  • Bite Attack. The spawn of Yog-Sothoth makes one bite attack against one creature it has grappled.
  • Teleport. The spawn of Yog-Sothoth magically teleports, along with any equipment it is wearing or carrying and any creatures it has grappled, up to 60 feet to an unoccupied space it can see.
  • Vanish. The spawn of Yog-Sothoth magically becomes invisible for up to 10 minutes or until immediately after it makes an attack roll. This overrides its tenuous natural invisibility trait.
  • Reverse Gravity (1/day, Costs 3 Actions). The spawn of Yog-Sothoth casts reverse gravity, it is immune to the effects.


These monstrous abominations resembles in part an ordinary humanoid, animal, or other creature, but what remains of its original form is only all the more horrible in contrast the portions of its physique that dissolve into a bloated, inchoate mass of otherworldly hideousness. Its overall shape gives the impression of a squirming mass accompanied by an indescribable monstrous stench. A spawn of Yog-Sothoth has a prodigious hunger, and given sufficient food it grows quickly to Large size, and rare specimens continue to stretch and strain until their seams literally burst into new fleshy tendrils and protuberances. A truly ancient spawn of Yog-Sothoth can be the size of a barn or even a small hill.

Not all spawn of Yog-Sothoth are massive or inhuman. Some (often twins to their more monstrous kin) remain roughly humanoid in shape and size, although their deformities still require them to wear disguises or layers of baggy clothing if they want to walk unchallenged in civilized regions.

Aberrant Birth. The spawn of Yog-Sothoth are begotten upon the world as the results of vile rituals in which cultists call down the essence of Yog-Sothoth, an Outer God from beyond the stars to impregnate a humanoid creature. The Outer God is not of this dimension or world; only by incorporating flesh and bone of a mortal can its spawn exist. Upon death, a spawn�s flesh rapidly melts until nothing remains but a crusty stain.

Although the spawn of Yog-Sothoth are naturally invisible, they exude a hideous, unforgettable stench that alerts others to their presence.

Harbingers of the End. Ancient legend holds that the spawn of Yog-Sothoth are inflicted upon a world to clear it of all sane life and to prepare the way for the return of the Great Old Ones. But it�s just as likely that the carnage and mayhem it brings upon the world is due to its ravenous and constant hunger for blood as any agenda from masters beyond the stars.

Section 15: Copyright Notice
Mythos Monsters (5E) © 2020, Legendary Games; Authors Michael "solomani" Mifsud, Robert J. Grady, Mark Hart, Jeff Ibach, Alex Riggs, Scott D. Young, Jeff Lee, Matt Kimmel, and Jason Nelson.