The rodents of the world of Reisum, or Remnant 1's DLC called, subject 2923. These particular rats were to be a bit smaller than the much larger humanoid rats of this world. The much larger ones where human sized or larger, while these are more like kid sized, and used in groups to attack players land or air. While these were designed for the DLC, Aleksei Kovalenko led the visual theme of the overall Rat character civilization for the main Remnant game, which you can see here: https://www.artstation.com/artwork/mD3ZlY
Daryl Mandryk led the visual theme of the overall rat environments for the main game, which you can see here: https://www.artstation.com/artwork/bKdkza
Built by Tohan Kim, see his work here: https://www.artstation.com/artwork/Kr161G