Moon-Beast Master

Huge aberration, chaotic evil

Armor Class 20 (natural armor)
Hit Points 171 (18d12 + 54)
Speed 50 ft., climb 20 ft.

22 (+6) 19 (+4) 17 (+3) 22 (+6) 18 (+4) 22 (+6)

Saving Throws Con +7, Int +10, Wis +8
Damage Resistances lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities cold, poison
Condition Immunities blinded, charmed, exhaustion, frightened, poisoned, prone
Skills Athletics +10, Perception +8, Stealth +8
Senses Blindsight 90 ft. (blind beyond this radius), passive Perception 18
Languages Aklo (cannot speak), Telepathy 300 ft.
Challenge 12 (8,400 XP)

Special Traits

  • Amorphous. the moon-beast master can move through a space as narrow as 2 inches wide without squeezing.
  • Innate Spellcasting. the moon-beast master�s innate spellcasting ability is Intelligence (spell save DC 18). It can innately cast the following spells, requiring no components:
    • At will: detect thoughts
    • 3/day each: charm monster, dispel magic, dominate person, dream, suggestion
    • 1/day each: compulsion, confusion, feeblemind, major image, modify memory, mirage arcane, phantasmal killer, plane shift (self only, can�t use)
  • Fear Aura. The moon-beast master emits a constant aura of fear in a 60-foot radius around him. A creature within this area of effect that can see the moon-beast master must make a DC 14 Wisdom saving throw or become frightened for 1 minute. A creature can attempt a new save at the end of each of its turns, with success ending the effect on itself. Once a creature succeeds at this save, it cannot be affected by the moon-beast master�s fear aura again for 24 hours.
  • Immutable Form. the moon-beast master is immune to any spell or effect that would alter its form.
  • Magic Resistance. the moon-beast master has advantage on saving throws against spells and other magical effects.
  • Magic Weapons. the moonbeast master�s weapon attacks are magical.
  • Nightmare Slave. the moonbeast master targets a living creature frightened by its fear aura within 30 feet of it. As a bonus action, the moon-beast master can cast dominate person against the charmed creature. If the target fails its saving throw to resist this spell, it becomes permanently in thrall to the moon-beast master. Dispel magic, wish, or similar magic can break this domination. Otherwise, the dominated creature can attempt a new saving throw following each long rest, ending the domination on itself with a success. If it fails three such consecutive saving throws, only dispel magic or similar spells can end the effect.
  • No Breath. the moon-beast master does not need to breathe.
  • Wind Walk. As a bonus action, the moon-beast master transforms into a gaseous form as if he had cast wind walk. It can end this effect and solidify as a bonus action.


  • Multiattack. the moon-beast master makes two claw attacks and two tentacle attacks.
  • Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) piercing damage.
  • Tentacle. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) bludgeoning damage. If the moonbeast master hits a target with two tentacle attacks on the same turn, it does an additional 14 (4d6) bludgeoning damage.


Moon-beasts have no voice or eyes, yet they �see� more than most and can project their thoughts into the very minds of those they wish to communicate with. These monstrosities hail not from any physical moon, but rather from the shared satellite of all slumbering minds in the Dimension of Dream beyond the wall of sleep. Here, the moon-beasts raise stone cities on the oily shores of night-black seas found upon the dark side of the dreaming moon, from which they launch long, dark galleys crewed by not-quite-human slaves that sail through the void of space down to the seas of the Dimension of Dream to seek new slaves and stranger, more sinister wares.

A moon-beast is 9 feet long and weighs 800 pounds.

Slave-Hunters. Moon-beasts are slavers, first and foremost.

They use their magic to curb rebellion or to quickly gain minions, but much prefer using physical and mental regimens of torment and reconditioning to break the spirit of their captives. They often work with the denizens of Leng, a metaphysically nearby dimension of nightmare and madness, although as often as not these planar neighbors serve the moon-beasts merely as slaves.

Mythos Worship. Worshipers of ageless entities from beyond the stars, moon-beasts are often compelled to travel to the Material Plane for strange and frightening causes, not the least of which is gathering suitable sacrifices for their mysterious and demanding lords.

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.

This is not the complete section 15 entry - see the full license for this page