The Nyghan Grii, “The Invaders”, and “The Enemy”, are a race similar to the Doels and the Mind Parasites. They are luminous spherical creatures with glossy ivory-yellow semi-translucent vine-like appendages ending in raw looking stumps covered in cilia. They posses a single great faceted eye at the top of their rugose bodies, with a puckered orifice below this eye. They come from another dimension and desire to wipe out all life on Earth so that they can colonise the planet. The vocalise in strange bird-like skirling or shrill whistles. They can produce a chilling blast. One of their methods of killing is to flay the flesh from their victims. They are probably the Hidden Ones. They fear the Elder God Vorvadoss.
The Nyghan Grii were created by Henry Kuttner and expanded by Chaosium as part of the role playing game.</p>