Adding Penumbra Monsters into Amnesia Help

[The Rock Worm]

I have seen the tutorial here on adding a desk into the Amnesia game, but it does not help in adding Penumbra monsters to the game. Let's say I wanted to add the Grey Rock Worm from Penumbra: Black Plague, how do I convert it to Amnesia?

When I get better at making Amnesia levels, I hope to add this monster into levels because it would be a great scare for players... but I first need to know how to add it. I have heard that the White Night Mod added the Worm into Amnesia, but I want to be able to add it to Amnesia without using someone own Worm (as it might have scripting oriented to the White Night Mod).