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Gargantuan monstrosity, chaotic neutral

Armor Class 20 (natural armor)
Hit Points 333 (18d20+144)
Speed 20 ft., fly 80 ft. (hover), swim 120 ft.

25 (+8) 21 (+5) 26 (+8) 7 (–2) 17 (+3) 14 (+2)

Saving Throws Int +5
Skills Intimidation +9, Perception +10
Damage Resistances bludgeoning, piercing, and slashing
Damage Immunities acid, fire, necrotic, poison, psychic; bludgeoning, piercing, and slashing damage from nonmagical attacks
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned, stunned
Senses blindsight 300 ft., passive Perception 20
Languages Common (can’t speak), telepathy 100 ft.

Challenge 23 (50,000 XP)


  • Magic Resistance. Gygazaks has advantage on saving throws made against spells and other magical effects.
  • Pain Threshold. Any attacks or spells that deal 6 points of damage or less do not deal any damage to Gygazaks.
  • Reflective Skin. Whenever a creature misses a ranged attack against Gygazaks, the missile or effect is redirected to a random square within the original effect’s normal range. Gygazaks can use its reaction to make a Dexterity saving throw against a DC equal to the attack roll, and on a success it can choose where the effect is redirected to.
  • Regeneration. Gygazaks regains 30 hit points at the start of its turn if it has at least 1 hit point.
  • Unbreathing. Gygazaks does not need to breathe or sleep.
  • Unkillable. When reduced to 0 hit points, Gygazaks is not slain and continues to recover from its injuries, regaining 1 hit point after an hour of rest.


  • Multiattack. Gygazaks attacks three times.
  • Bite. Melee Weapon Attack: +15 to hit, reach 30 ft., one target. Hit: 44 (8d8+8) bludgeoning and piercing damage plus DC 23 Constitution saving throw or poisoned condition for 1 minute.
  • Claws. Melee Weapon Attack: +15 to hit, reach 30 ft., one target. Hit: 44 (8d8+8) bludgeoning and slashing damage plus DC 23 Constitution saving throw or poisoned condition for 1 minute.
  • Maw Laser. Ranged Weapon Attack: +12 to hit, range 150/600 ft., one target. Hit: 50 (10d8+5) fire damage.


Even in the darkest and most distant voids of outer space there is still life to be found…of a sort. No matter where it currently dwells, whether the realms cosmic, deep subterranean seas, or in underground caverns, a gygazaks sluices through air and water with equal ease. This creature’s entire body is stark white and devoid of color save for the cyan sheen cast by the energies it projects, focused in its maw behind rows of serrated teeth each as big as a greatsword.

There is no certainty behind the origins of gygazaks, but they are thought to be an evolved offshoot of aboleths or the result of an insane arcane amalgamation of sharks bred with the water aberrations. Neither theory is unfounded—like the ocean predators they are in constant movement and they do possess supernatural abilities, yet if they truly are related to psionic aberrations they have been denied any vastly superior intellect and left only with enhanced animal cunning. This does not make gygazaks any less lethal however, and in fact they are far tougher and more dangerous than either of their possible progenitors, capable of laying waste to staunchly defended capital cities with little resistance.

Section 15: Copyright Notice

Tome of Beasts 2. © 2020 Open Design LLC; Authors Wolfgang Baur, Celeste Conowitch, Darrin Drader, James Introcaso, Philip Larwood, Jeff Lee, Kelly Pawlik, Brian Suskind, Mike Welham.

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