These hand-sized mosquitoes use their steel-hard proboscis to penetrate skulls and suck out cerebrospinal fluid. The droning of their wings induces a hypnotic trance, allowing them to feed in peace. As both adults and gestating larvae they can sense sentient minds within 200 meters. The feeding is rarely lethal on its own, but the hole made in the scalp, skull, and meninges can easily develop a lethal infection.
Where it comes from: Psysquitoes grow in stagnant water, much like mundane mosquitoes. Unlike mundane mosquitoes, they can gestate for decades, only hatching when they sense sentient minds. Once they have fed for the first time they will lay their eggs, and then seek out more fluid to feed their young.
What it wants: Psysquitoes do not need cerebrospinal fluid for themselves, but feed it to their larvae. The larvae drink as much as they can before going into gestation, and that is all they will ever eat. Adults can usually last for one to two months before dying of starvation, depending on their level of activity.
What it needs: larvae need ccerebrospinal fluid to grow, and will take in as much as they are given. As adults they do not eat at all, and live to serve their larvae.
What it will fight for: A Psysquito will only attempt a fight if starving. Otherwise, they always attack from ambush. If their drone does not work and their target fights back, they will attempt to flee, but will usually attempt another ambush.
What happens if you eat it: Psysquito exoskeletons incorporate significant amounts of metal, and are thus inedible. The metal also allow their exoskeletons to be used like kettles; you can cook a psysquito into a thick nutritious soup simply by throwing it on a fire.
What can be crafted out of it: Drunk raw, partially digested cerebrospinalfluid is a minor stimulant. It is also used as the base for many potions that affect the brain.