Quote Originally Posted by Kraco
Where did that thing come from in the first place? If it did come from somewhere, it might want to go back there - and needs lots of power for that purpose
Quote Originally Posted by Jessper
So, it seems to me that Father is a tiny bit of the truth ripped out into the real world.
Putting these two together, (and putting aside the idea that what Father wants is companionship), I get a really big hunch that this would make a lot of sense as for postulating about what is going to happen with the gigantic array that Father has been building using Amestris.

Throw in "desire for companionship", and, well, he just might be planning on taking everyone along with him... He was, after all, "nice" enough to give Hoenheim a freaking immortal body (and spare his life).

http://en.wikipedia.org/wiki/Homunculus