Great Race of Yith

The Great Race of Yith—also known as Yithians—are a race that swap minds with other races throughout time and space in an effort to learn everything they can about the universe. The most famous of their inhabited forms are the conical beings of Earth's prehistoric past. The swapped mind subsequently inhabits the Yithian's body until they return, jotting down all they know of the home for the Yithians' great libraries.

In the RPG...

The Yithian's cone-shaped bodies are particularly powerful, though because of their place in time, it's highly unlikely that they would be encountered—unless of course someone were fighting them while occupying one of their own kind. A single hit from one of the Yithian's pincers does an average of 21 damage, so if an Investigator were to face one, they would probably be killed in one hit.

    The only change the 7e Malleus Monstrorum made was to decrease the range of the Yithian's STR. Everything else remains unchanged.

In a video game...

There are two ways in which Yithian's could be used in a video game that would make them quite interesting. First of all would be dealing with one in a possessed human body. Though they would be outwardly human, their technological prowess could come into play. The other way would be in the body of the Yithian that enacted the mind-swap. It is said the victim is initially restrained, but once trust has been established they are able to freely walk the Yithian city. Both of these could easily be twisted into an interesting scenario for a game I'm sure. It should be mentioned that there were Yithians in Call of Cthulhu: Dark Corners of the Earth.

In a film...

I eagerly await the day we get a The Shadow out of Time movie. It will probably never happen, but one can dream.