[quote=@ZAVAZggg]
<Snipped quote by Techspert>

So it's an energy generated by a field surrounding the outside of Omniversal Clusters then? 
[/quote]

I wouldn't say it's generated by a field. Quantum Field Theory states that everything that exists in our world can be explained by the combination of several fields that occupy the same 3D space and all matter and energy is just an excitation of one or more fields at a particular location in space. We technically don't know how many possible fields there are, only that they're literally everywhere. So you could almost think of Amaranthine as a new type of "matter" that's caused by a stimulation of the Amaranthine Field (in the same way that light is nothing but a stimulation of the electromagnetic field).

As to where it comes from, you can kind of think of Existence as a giant bubble that contains all the dimensions, but it's so big that good luck trying to get from one side to the other. If you exit this bubble, there's nothing but this staticy substance that tears apart anyone and everything that enters it, down to the very soul. Some beings have very special protections to this (like the Outsiders) but as a general rule, nobody can be Outside for an extended period of time and survive. But it's not empty forever, and you can sometimes find other things out there, like the Amaranthine world (which happens to be fairly close to the edge of Existence) and even other kinds of worlds yet to be accessed. But I don't have too much information on those since there've only been three encounters with anything that didn't originate from Existence in the history of MR.