Penumbra monsters doing a wave
This was made by going to 'entities' and spawning 'tf2 ghost' which is originally judith mossman. Then you download a penumbra monster ragdoll from the workshop and also download model manipulator. Spawn in a ragdoll and right click it, then spawn the tf2 ghost and left click on it to turn it into a penumbra monster.
Appears on these pages
The video shown on the right is a video of an addon prop from the game Penumbra: Black Plague...