Name: Sex-Spawn Pit
Type: I have no idea what this is, or even if it's an organism in any way we recognise the term.
Habitat: Primarily HSIO urban centres, although some wild ones have been encountered underground.
A pit with flesh-covered walls about eight to ten feet deep. Thick fibrous growths extend from the edge of the pit and connect to bulbous pod-like chambers partially buried in the ground. The chambers are used to gestate and grow the sex spawn. The spawn are not really offspring and instead function more like flesh manikins. They are short-lived and resemble hairless human beings. The sex-spawn pit appears to have some kind of mild telepathic or empathic ability to sense what individuals in its vicinity find sexually appealing and produces sex-spawn with bodies that cater to these desires.
Anyone unfortunate enough to fall into a sex-spawn pit will be absorbed into the fleshy walls. Bizarrely, this is a complex process that requires to the prey to be sexually aroused to the point of orgasm before the pit can absorb them. In order to achieve this, the pit excretes its flesh manikins into the pit to copulate with the person or persons trapped within it. The pit will continue to spawn manikins and send them into the pit until the captured men or women are overwhelmed and stimulated to orgasm. At which point they are absorbed into the walls or floor and lost.
The higher HSIOs seem to enjoy throwing captives into these pits as a form of entertainment (our men should be fully aware by now of the futility of surrendering to the more intelligent HSIOs—these are alien organisms with a set of values completely at odds with our own).
Sex-spawn pits occurring in the wild will attempt to use their flesh manikins to lure or physically force passer-by's into the pit. The flesh manikins themselves are weak and degrade quickly over time and distance from the pit that spawned them.
The sex-spawn pit is harmless unless fallen into. Once inside, the slippery, undulating flesh walls make it very difficult to climb out of and the constant waves of amorous flesh manikins will eventually wear a person down and force them into sexual intercourse.
When under attack the pit will close and retract the gestation pods underground. The pits are relatively easy to render harmless, but much more difficult to eradicate completely. Pits reported as destroyed have been known to fully grow back after a week or two.
Of more concern is how they came to exist, especially with their bizarre feeding cycle. Are these organisms, or more akin to biological machines custom-created by the HSIOs to dispose of their enemies in ways the HSIOs find entertaining?