Gn’icht’Tyaacht

The Gn’icht’Tyaacht are tree spirits native to the jungles of West Africa, and are only able to leave their Nuwanda Trees at night. They are seven-foot tall, lanky humanoids with long pointed heads. They also have huge claws and prominent, sharply pointed teeth.

In the RPG...

The Gn’icht’Tyaacht can alter their skin so that it becomes thick and woody, creating a 5-point armour. Aside from that, they have no special immunities or abilities. They do, however, have a form of communal magic whereby they all know if one senses an intruder in their glade, as well as the ability to put said intruder to sleep, who must make two opposed POW rolls against the Gn’icht’Tyaacht with the highest POW to stay awake. An average Gn’icht’Tyaacht only has 35 POW, so the odds of an average Investigator falling asleep is 40%. Strangely, the Malleus Monstrorum says that they are voracious flesh-eaters, but then also says, "It is taboo amongst the gn’icht’ tyaacht to attack anyone within a grove, unless that person breaks the rules of hospitality by first attacking one of them." Perhaps this just means they leave their glade to eat.

    Gn’icht’Tyaacht did not make it into the 7e Malleus Monstrorum.

In a video game...

The only issue with including a Gn’icht’Tyaacht in a game would be their habitat, though I suppose it's possible that a Nuwanda Tree could be grown elsewhere in the world and come with its own spirit.

In a film...

I can't see any reason that the Gn’icht’Tyaacht wouldn't work in a film. Tree-like humanoids have appeared in films before, but I can't recall any that were of the horror genre.