Encyclopedia Entry
Grotesque enchantresses with tentacles growing from their head and lower body who form peculiar societies underground. Highly intelligent and dangerous with an extremely obscene mentality, they possess the power to manipulate the mind. They are of a different mind from even the radical faction of the Mamono Lord's army, and although they have been influenced by the Mamono Lord, they are not her underlings. According to one explanation; it is purported that they are a race who serve chaos monsters that slumber deep within the depths of the sea, and it is their duty to fill the land with their minions. They appear above ground seeking prey and they will not only target human men who serve as their partners, but also actively assault human women to entice them into becoming the same race.
They seize their prey as if embracing them from behind and slip their tentacles into the prey's head through the ears to directly pour in mamono mana and pleasurable signals. The rational mind and thoughts melt away, and the mindflayer slurps them up. The prey's mind is consumed by pleasure and the watery sounds of the mindflayer's tentacles noisily stirring about inside their head. The prey will be completely helpless and unable to do anything but gasp and moan. If the prey is male, then a lewdly obscene mind suitable for the partner of a mindflayer will be implanted inside his defenseless head. Once a man becomes a being that exists to have sex with a mindflayer, his body and mind will no longer put forth any resistance at all when the mindflayer habitually coils around her husband using her body and tentacles to induce pleasure. Such men will experience joy as their mind is melted and slurped out along with their essence.
On the other hand, in the case that her prey is female, it is said that she won't immediately be converted into a monster, and will instead be released while still human. However, just getting a whiff or the odor of a human man or his essence will be intoxicating, and she'll be unable to maintain her ordinary thought processes. In all likelihood the woman will have been partially modified so that only parts of her memories, values, senses, and perception will be that of a monster. She may have been granted only "a monster's olfactory sense", or she may have been implanted with a monster value such as "taking pleasure in being sexually desired by others", or a false memory such as "becoming a monster and having sex with a man."
While a woman will retain her human body, she will be inflamed with a monster's passion, and learn the pleasure of being a monster. No matter how much she masturbates and has sex, she will never be able to experience fulfillment in her human body, and her mind will be eaten away. She will start to frequently recall the pleasure and watery noise of having her mind slurped, and despite having been released will end up making her way back to the mindflayer on her own. When the mindflayer enjoys herself by sipping the taste of a woman's mind, she will notice that it is changing into something appropriately obscene and befitting of a minion. As if to reward her, she will change the woman slightly closer to being a monster. As these events repeat, eventually the woman will beg to be changed into a monster. Sometimes such women will sexually assault men while still human, in order to show off that they are of the appropriate mind to become a minion. After debauching her mind to such a degree, a woman will finally be accepted as a new "mindflayer".
Also, they themselves are always immersed in the obscene watery noises. Even if they don't have any prey, they will use their tentacles on their own bodies. In order to make sex with their partner more pleasurable and fulfilling, they continually melt their mind and reforge it into something even more obscenely debauched.
The squid-like thing covering their lower abdomen frequently squirms as if it were an entirely separate organism. It is said that they pat it lovingly with tentacles and then it releases white viscous fluid. "Men who become intimate with them are suddenly transformed into squids, becoming stuck coiled around their hips with a tentacle slipped inside their lower abdomen." This has been observed, but even when asked about the truth, the only response of the mindflayers is to smile alluringly.