Habitat: Fertile plains and valleys. Artificial gardens.
Outwardly looks like a pretty young lady in a gaily coloured and extravagantly large crinoline dress. An eyewitness described them as looking like a group of actresses on the set of a period drama. One thing most observers notice is that the proportions of the crynolies seem off. They are deceptively tall, as if their legs are longer than they should be.
Underneath their 'dresses' the crynolies have four long and spindly legs, with each pair arranged perpendicularly to the other—like the legs of a small table. The legs look insectoid in shape, but resemble human flesh and skin, and terminate in what looks like human feet. Their most alien part is a bulbous sac or abdomen hanging down from the centre of their body. This too is covered in what looks like human skin, but otherwise resembles no part of the human body aside from the vulva-like orifice at the tip. The 'vulva' is surrounded by clusters of short tubules. These emit the fumes the crynolie uses for defence and to overpower her prey.
The crynolie is capable of emitting fumes that put anyone breathing them into a highly suggestible state where they blindly follow any instruction give to them by the crynolie. While in this state the victim is unable to take any actions of their own volition.
Once she has her prey under her control, the crynolie will then ingest them into her fleshy abdomen through her 'vulva'. Initially it was thought they simply ate their victims, but—as with most HSIOs—the reality is far more complex.
The crynolie's abdomen contains a stretchy bag organ—a kind of stomach or womb—large enough to contain an adult human. This organ has thick padded walls and is surrounded by a net of muscular fibres that give the crynolie fine control of internal movements. At the top of the containment organ is an air bladder. The crynolie places her prey's head within this bladder and supplies them with oxygen so they do not suffocate inside her.
The next stage is to overload her captive with sexual excitement. The air the crynolie gives to her prey is laced with various sedatives and aphrodisiacs. Stronger aphrodisiac juices are secreted inside the containment bag and sensually massaged into the flesh of her captive. The containment organ also contains various structures analogous to human sex organs and the crynolie selects and uses them depending on the sex and sexual preferences of her captive.
The big question is why?
I don't believe the crynolies are feeding off our sexual arousal. I believe, like other HSIOs, the crynolies are after something else from us, and massive sexual overstimulation is just a tool to expose or loosen it.
(As to what this 'something else' is—I think it is what various religions throughout history have referred to as the human soul. As to what this infers about the nature of H-space and the HSIOs... No, I'm not ready to believe this. Not yet.)
The mind control fumes of the crynolie must not be inhaled. Fortunately they have a relatively short range of effect and require concentrated amounts. Likely the reason why crynolies are encountered in groups.
Unfortunately, tackling them from a distance is also difficult. The 'dress' of the crynolie is part of their body and composed of a flexible, durable material that is resistant to both small arms and bladed weapons. If threatened the crynolie retracts her upper half down into her dress and emits a dense fog to cover her escape.
Medium to High.
As devastatingly effective as their paralysing fumes are at close range and as awkward as they are to engage at distance, I suspect the crynolies are actually low down in the 'demon'-type hierarchy. I fear there is worse out there. Far worse...