Monsters: Onichus

I’m imagining a monster alien species that is created out of humans. The aliens infect humans during their lives, as this is the only way they can reproduce anymore. They’ve been defeated by a rival alien species, and now take shelter within humans.

The disguise is only effective because they hide within the brain electro-chemistry of the humans. They slow down the receptor sensitivity in order to allow themselves more time to plot their revenge and return to glory.

Unfortunately that has started to have effects on humanity. These humans exhibit strange self-mutilating behaviors and have reduced fertility. Subjectively, they describe their experience as moments of β€œintense deja-vu”, like β€œtiming slowing down”. Some have discovered they can tune into these feelings and some times control them.

When they do so, they can see things on higher dimensions, and can interact with items at far away distances, via torsion fields. To the outside observer, the intrusion and interaction appears as fragments of the person reaching out and touching them from β€œstrange mirror-like surfaces”.

Upon death, the alien thought-pattern take complete control and slow down the decay of the body. The aliens appear as β€œzombies” with telepathic and telekinetic powers. They are slowly decomposing and dying, but wield immense powers.