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Mind Tyrants

"Your kind believes itself to have been created as part of some great design. To serve a grand purpose. You are correct. Your species was meticulously curated and painstakingly bred from a specific pedigree, itself stretching back eons beyond measure, to fulfill a singular glorious end... to feed us.
-Penuh'benci, Mind Tyrant Raid Leader

The insidious cephalopodal-helminthic aberrations known as the Yith are a species of parasites that impose a complex pseudo-symbiosis upon unwilling but compatible Hominid species as part of their repugnant life-cycle. This grotesque physiological metamorphic transmutation is known as Mengubah or the "Cephalorphosis". Despite their frail appearances, the Yith are feared throughout Aemaphia for their potent psionics. The entirety of the Yithiid collective possess the innate ability to enthrall the weak-willed or obliterate the minds of those who oppose them with a concentrated blast of psychic energy, leading the Yith to commonly be referred to as Mind Tyrants. Other, more vulgar terms for these aberrations include "Brain Eaters", due to their dietary preference to consume the cerebral flesh of conscious sapient brains. Melting away the skin, sinew, and bone of their victims, Yith can devour the brain of a subdued target in a matter of seconds, adding to their already nightmarish reputation. Worst of all, these despicable creatures are merely the vanguard of an immeasurable interplaner invasive enterprise known throughout The Cosmos as the Pembantaian or the "Abattoir". The obscure agenda of the Abattoir is too vast in its scope to be fully expressed in the limited confines of language, however the term "selected" by the Yithiid themselves to identify their civilization does hint at the potential purpose of these foul Mind Tyrants. To them, all of Existence is a slaughterhouse.
A blight that has already infected every corner of the Cosmos, Yithiid invasion cells have been found on every life sustaining Sphere discovered; although special attention is categorically placed on Garden Spheres over the more volatile Oasis Spheres. Each planetary cell of the Abattoir acts independently but towards the inscrutable goals of the Yithiid collective. These cells, which are made up of several autonomous colonies, are led by a cabal of Ol'yithiid Cerebrodes linked into a loose pseudo-hivemind, in addition to their despotic Uu'yithi-tinggi lieutenants.


Basic Information

Ecology and Habitats

"Our rivals? The Yith do not merit such condescension in this ill-conceived comparison. They are vain-glorious vermin absent-mindedly eroding the very structure they themselves inhabit. They are nothing more than pathetic egomaniacal maggots playing pantomime in the miring muck of mortal filth and, lacking the innate faculties or basic capacity to understand the full scope of their existential surroundings as well as the utter insignificance of their own design, call it empire."
-The Dweller in the Deepest Sea, Chronicler of the Aboleth Ascendency
There are many subspecies within the larger Yithiid. They include...
  • The Cerebrode - The eldritch horrors that lead a specific Yithiid colony. Also known as Ol'yithi-barsama, which roughly means "Pure Form Collective". They are enormous masses of congealed Yithiid cerebral biomateria which vaguely resemble a nightmarish amalgam of an cephalopod and a brain. Cerebrodes possess frightening deity-like psionic powers and, through their oppressive hive-mind, have near-total control over every Yith within their colony. They are also known as Mind Titans or Olyith.
  • Uu'yithi-tinggi - The towering lieutenants of a Yithiid colony, administrating under the inscrutible dictates of the Cerebrode hive-mind. As a result of their unique Cephalorphosis, Uu'yithi-tinggi possess two additional elongated tentacles sprouting from their face, two additional extended arms, and even more potent psionic abilities. Their name roughly translates to "Higher Form", although they are commonly known as Mind Sovereigns or Uuyith among Adventurers.
  • Yithi-dasar - The majority population of any given Yithiid colony. This subspecies is the most likely to be encountered by the other species of Aemaphia, and therefore serve as the basis from which the species earns its name. Their name roughly translates to "Basic Form". They are also known as the dreaded Mind Tyrants or simply Yith.
  • Body Thieves - These horrifying body snatching aberrations serve as spies and saboteurs for Yithiid colonies. Vaguely canine in shape, these grotesque quadrupedal monstrosities lack anything resembling a head. They are capable of reducing their size to fit within the empty skull cavity of a Yith victim. Through disgusting applications of innate biomancy, the Body Thief can reanimate the corpse, serving as the victim's brain and restoring basic bodily functions to the corpse. These horrors are also known as Ustil-aggo, which roughly means something akin to "Body Mover".
  • Neh-thalggu - Large crustacean-like monstrosities capable of safely housing disembodied brains within vile blister sacks and transporting them back to the Yithiid colony for consumption. Their name roughly translates to "Brain Storage". Among adventurers, they are often called Brain Collectors.
  • Kosong-neyith - When a larvae is separated from the safety of the brine pool within the core of a colony, its natural survival instincts compel it to consume. As it does, it grows in size. Eventually, it becomes a colossal worm-like aberration known as a Kosong-neyith. The primitive Kosong-neyith are veracious predators, but have a strange innate compulsion to prey on their own kin. They seem to be almost "designed" to hunt Yithiid, possessing unique psionic nullifying powers that render all Yith species vulnerable to direct assault. The name roughly translates to "Empty Formless", but they are more commonly known as Mind Worms or simply Neyith.
  • Ali'thisyith-ulat - Cephalorphosis itself implies there is an original state and cycle to the Yithiid, prior to its current symbiotic and parasitic existence. This theoretical nightmare is, in fact, true. In the darkest depths of the Far Realms, the Ali'thisyith-ulat watch their bioweapons harvest psychic energy across the Temporal Realms. These titanic worm-like horrors are similar in body type to the Kosong-neyith, but possess god-like intellects and reality warping psionic powers. They crafted the Abattoir and the Yithiid specifically to harvest the raw psychic energy that is produced from the mortal world, and even their creations are unaware of their existence. Their name roughly translates to "True Perfect Form". Among the few mortal species aware of their existence, they are known as Conqueror Worms.
  • Additional Information

    Social Structure

    "When one beholds the majesty of the Yithiid, the most common response is not awe, but mind-shattering madness. And truly—this is a mercy. Madness shields us from the full devastation of the Yith’s oppressive psionic will, which shreds every neural path in the skull with each blast, locking us inside a twitching, helpless husk. In this blessed delirium, we are spared from understanding the true horror of our predicament: the surgical, psionic precision with which Yith tendrils peel back the flesh of the head, flensing it like ripe fruit. Insanity, in its divine grace, protects us from grasping the unspeakable truth of the Yith—that we are still alive, still aware, as our own brain is devoured, pound by pound and neuron by neuron. What a kindness to bestow upon oneself?
    My mind however, when confronted with the glory of the Yith feasting on my fellow companions within the iridescent prison of the Infregercia, endured... much to my own endless horror."
    -Abjul Alhazrejd, Djinn Scholar of the Far Realms

    Civilization and Culture

    Common Myths and Legends

    The True Origin of the Yithiid

    My theory is that in the same way Illithid make lesser monsters to serve them, the Illithid are themselves unwitting weapons of some greater force; the Alithelid (from the Greek Alithis meaning True). These worm-like horrors are physically similar to Neothelid but possess intellectual potency far greater than even Elder Brains. They control all Mindflayers from the safety of the shadows. These Alithelid view illithidae as nothing more than drones or biological weapons.
    Furthermore, Neothelid exists as a means to "clean up" collapsed mindflayer colonies. The Alithelid don't want renegade Illithid arcanists or alhoon running around. The Neothelid are a built in failsafe to prevent any colony going rogue.
    Lastly how does this connect to the Elder Brain itself? When a colony's Elder Brain has consumed a specific but unimaginable amount of cerebral mass, it will command all Mindflayers to join it. The Elder Brain will consume and merge all the Illithidae into its mass within their brine pool and enter a psychic torpor, leaving the larvae unattended... Just like their primordial ancestors. Slowly the larvae consume each other until one remains. Not yet a Neothelid though, this surviving larvae will begin consuming the slumbering Elder Brain and its vast trove of psychic energy... Become a newly formed Alithelid.

    Scientific Name
    Xeno Annelid Yithae
    Geographic Distribution

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