A gnome cultist consults an all-knowing aboleth In aquatic abysses, aboleths dream of dead empires and orchestrate plots that unfold across ages. These elusive, amphibious immortals physically and mentally overwhelm their victims and transform creatures with a slimy, aberrant infection, reshaping other beings to serve them beneath the waves. Aboleths possess terrifying intellects and have alien…

The typical dhuthorex is a hungry and thoughtless beast, chasing prey through the depths and venturing onto land only to pursue easy prey.

Latching onto the Thin Places between realities, a cackling chorus of chaotic laughter in hysterical and dissonant tones tears through the minds of those who bear witness to the cosmic being. As it peers out with its three unblinking dark pools of eyes, it observes and surveys the realities as its mass of fleshy tendrils dangle from its slimy form. It ripples with black voidlike hues and splashes…

Given the strange features of this massive, muscled, eight-foot-tall figure, it is difficult to say if it was once human or a troll. Its bruised skin stretches and rips over barely contained muscles. It is pin-headed, with an emotionless face, glassy-eyes, and a slack-jawed maw. Most disturbingly, its ribcage is splayed open, revealing guts and viscera along with a smaller, vestigial creature…

The massive creature slumps forward on two stocky legs with bloated and bleeding feet. Its huge gut drags along the ground with several open sores weeping with puss and ichor. Its face is buried in multiple chins as acidic drool drips down them, running down its belly. It opens its mouth as it lets out a gurgling moan, and it reaches into one of its open sores, pulling out a pile of pus-covered…

Emerging from the contaminated waters is a humanoid figure with disturbing piscine mutations. Their body is covered in glittering scales of sea green, midnight purple, and deep blue. Their monstrous face has two large, bulbous eyes and a gaping, fishlike mouth filled with oddly-shaped teeth—a mixture of humanoid, shark, and other aquatic animals. Spindly, fleshy whiskers surround their fish lips.…

The creature is composed of rippling muscles, with leather straps holding in place rusted pieces of armor forming a pauldron, bracers, and belt. Its head is enclosed in a massive metal dome with no discernable face. Still, the creature’s heavy breathing can be heard from within the dome and it seems completely aware of its surroundings. In each hand it carries a makeshift metal blade, made from…

Towering over the other Deep Dregs is a muscle-bound warrior with a head shaped like a hammerhead shark. They carry a colossal shield made from the opalescent shell of some mollusk, and their gnarled hide is covered in algae and barnacles. A thick chain is wrapped around their wrists, attached to the massive, spiked harpoon they carry. Champions of the Duchess, Deep Knights tower over others of…

This hulking mutant stands over ten feet tall, its swollen body grown beyond normal human proportions. Its rippling muscles and engorged veins pulse beneath its thin discolored skin. The hulk’s flesh has split open in places over its body, barely able to contain the bulging and expanding sinew of its tree-trunk-like limbs and wide torso. Its head, however, is strangely small given the size of its…

Chuuls that hail from Nhimbaloth’s poisoned, swampy world of Voidbracken can feed on psychic energy as easily as flesh. Fortunately, voidbracken chuuls are exceptionally rare and lair only where Nhimbaloth’s influence is strongest.

This large moth has brilliantly patterned wings that glimmer purple and green. The delicate membranes feature hypnotic shapes that resemble screaming human faces. The creature has a grotesque bat-like face with a curved antenna sprouting from its forehead ending in a bioluminescent lantern that gives off splashes of prismatic light. Its eyes are a mosaic-like fractal, and delerium dust drifts…

Large Aberration, Chaotic Neutral AC 16 Initiative +2 (12) HP 142 (15d10 + 60) Speed 25 ft., Swim 50 ft.

An adventurer stumbles on a kuo-toa archpriest and servants of its strange gods Kuo-toa have slimy, humanoid bodies and the heads of goggle-eyed deep-sea fish. They claim they once dominated whole worlds, their empires spanning land and sea under the blessings of piscine gods. The kuo-toa can’t say what disaster brought their glorious civilization to an end, but elves, humans, mind flayers, and…

Otyughs live to eat—the more disgusting the meal, the better. They consider all non-otyughs that come within reach dishes in life’s endless buffet. In dumps, sewers, polluted ruins, and similar murky depths, otyughs devour garbage, carcasses, and anything else their tentacles can cram in their expansive maws. Some creatures ply otyughs with trash to recruit them as watchful—if…

Fishlike Fanatic of the Deep Kuo-toa have slimy, humanoid bodies and the heads of goggle-eyed deep-sea fish. They claim they once dominated whole worlds, their empires spanning land and sea under the blessings of piscine gods. Kuo-toa undertake contrived plots to propel themselves to dominance, often kidnapping people to learn their secrets or making dubious sacrifices to bizarre gods. These…

The servants of kuo-toa archpriests, kuo-toa whips—so named for their role in enforcing order among other kuo-toa—lead war bands in carrying out the commands of their superiors. In return for their zeal, these kuo-toa are granted minor magical abilities and pincerlike weapons for subduing foes. In battle, whips drive on other kuo-toa with threats of violence and burbling chants.

Du’ulora are spirits of fury that feed on anger and inspire rage in mortals. A du’ulora is a maelstrom of eyes and wings, bound together by flesh that seems like solidified shadow. It can extend up to three tentacles from this dark mass. A du’ulora can turn a victim’s anger into manifested heat; in battle, it grapples its victims and burns them with their own fury. Manipulating Fury. While they…

This horrific thing has no shape or body resembling anything from the Mortal World. It roughly resembles a tree stump with four root-like legs each ending in a misshapen hoof. It has a wet, mottled, bark-like hide, and sprouting from the side of it like branches are knobbly arms ending in sharp claws. The top of its body is a gaping, tooth-filled mouth. It is shoveling chunks of horse-flesh into…

A gray slaad, a death slaad, and a green slaad spread chaos in their wake Green slaadi come into being when the propagation methods of red or blue slaadi affect certain creatures capable of casting spells of level 3 or higher. Green slaadi are more intelligent than their blue and red brethren and often direct their kin to portals where gray slaadi have identified Humanoid communities ripe for…

Chuuls originated in forgotten ages when aboleths and stranger beings ruled alien empires beneath the waves. The aboleths transformed numerous deep-sea predators into servants that could venture beyond the seas to claim more magic and creatures to exploit. Chuuls are the most enduring of these bizarre servants. Many chuuls serve aboleth overlords, carrying out their whims amid lightless seas and…

Once a priestess committed to healing the sick through divine rites, the Weeping Widow abandoned the gods after a personal tragedy and turned to sinister science. Believing she knows how to best treat the suffering and make them stronger, she employs a harrowing regimen of alchemical and medical experimentation to wipe minds and alter bodies, whether the patient wants the treatment or not.…

Amidst a web of fractured realities and glimpsed timelines sits an arachnid creature with twisted features. Its elongated form writhes and shivers as it clambers across its broken glass mosaic of possibilities. Its fanged maw gnashes and chomps. Within its movements one can make out faint resounding reverberations of possible movements and reactions that did not occur, as if with every step the…

Almost as numerous as red slaadi, blue slaadi are muscular brutes with vicious blades extending from the backs of their claws. These claws carry a magical curse called chaos phage, which can transform victims into red or green slaadi. Blue slaadi accompany red slaadi and behave similarly. They innately know the signs of chaos phage and avoid slaying creatures that carry it or other slaad curses.

A kuo-toa whip and kuo-toa monitor lead a midnight raid Kuo-toa monitors control the day-to-day life of weaker kuo-toa, directing their work and worship. They also train beasts or monsters in the kuo-toa’s service—such as chuuls or giant crabs —and command them in battle. Archpriests bless monitors with the power to control their underlings and to subdue foes with electricity channeled through…