Ok,so in the entire history of movies iv'e watched,there was only this one movie that scared me when i was a kid:
Now,spoilers here if you have never seen the movie:
So basic premise is they dig too deep(in the ice) and uncover some type of alien.Thing about this alien is,it's like a love-craftian horror shape-shifter.It Kills you then disguises itself as it's victims.Then it does it's shit when it's alone with another victim,so on so forth until your surrounded by these things.
Again,if you've never heard of or watched this movie,here are some links to what im talking about,there about 3 or 4 minutes each.
the trailer.
http://www.youtube.com/watch?v=ouZkkIsLiNg The thing itself,disguised as a dog.
http://www.youtube.com/watch?v=iNjOW2zuRYc&feature=related the paranoia sets in
http://www.youtube.com/watch?v=FkNyC6MQMj0&feature=relatedNow,To the point of this topic,I thought it would be immensely F'ed up and scary in the good way if we could somehow mod this "thing" into DF.
Example:Your dwarfs uncover it.it proceeds to kill those dwarfs and pose as them,doing the tasks you set the real dwarfs to do and otherwise mimicking them perfectly.at a random time,it reveals itself and proceeds to devour your other dwarfs.Dogs would sense the difference between real dorfs and thing-dwarfs.When revealed in it's true form,it Is generated with a random number of tentacles,mouths,organs and so forth.Would act as an ambusher when in true form.For every dwarf it kills another one is created.
Reality:i realize that that can't be done via the raws and the tools the modders have to use at this present time.I myself am inexperienced,and have created this topic therefore to come up with some way a creature could be created acting similarly to the thing.