: Compressed collections of 3D models or textures extracted from game files for use in other engines.
One of the most direct matches for a file named Monolith.rar is found in the Cults 3D community . It is a compressed archive containing for a "Monolith Spawn" action figure. monolith.rar
If you have a specific source or file size in mind, I can help narrow down the contents. : Compressed collections of 3D models or textures
: Large-scale overhauls that combine various community-made assets into a single "monolithic" package. monolith.rar
: Hobbyists use these files to print and assemble complex, articulated figures. 2. Music Archiving (Punk Rock)
The name "Monolith" is also tied to a popular open-source CLI tool on GitHub written in Rust.