Well, I just try to find names for them that fit well. About the Portal to the Great Nothingness - it reminds me rather of the "hole in the universe", where it ends, and behind the hole there're unspeakable horrors and timeless great demonlike archevil beings and such. Like the universe in a model of a ball and the Great Nothingness surrounding it. The universe is the shining pearl and Great Nothingness is the hostile first-been-there "chaos" that only can destroy and hate.
Just an example of how those names come out.
