Werewolves

[jamesinar]

 Let's have a full moon event where someone turns into a warg. The event could give you a little warning so that if one of your colonists is the werewolf  you can lock them up. You'd probably want to include silver as a door option and make that the only thing that would hold them.

[Lonely Rogue]

Sounds good for a mod! I'm not so sure about in vanilla, though...