Null Void

The Null Void is a large, almost indefinite area covered in a maroon fog, you'll need a Null Void Projector (Gen1 and Gen2) or a Null Void Grenade to access it. I'd suggest being very careful if you find yourself in here as you cannot leave without using a Null void projector. It has a small green house from the original map and a horde of violent, deadly guards that can kill you in less than a minute.

the null void in the classic series hold vilgax until he escapes and kevin 11 all the way up until alien force at the start