Last few days I was talking to Renee about earth goverment inside SC2 story, and due to what I've heard, I assume those 2 Ghosty-looking units are probablly from and for earth government. Far more advanced than terran but less advanced than toss, though their production ability can easily overwhelm all 3 races at once in SC2. However the earth government may never appear in SC games at all, maybe not even SC3.
That's a crystal?? lol i thought it's the third eye. It actually looked like a spider eye in the texture file but the UV somehow only caught half of it... but yes it's a good idea to make it blink like lava. XD
PS: I meant the belly lighting thing<sub>, when I tried to put a lot of them together, it is kind very catchy, which is good for ID, but need to be more subtle.</sub>