User blog:Alchimous/Teleportation Matrices

We all should know how teleporting works. If you don't stop using it for your characters until you do. Your spell bores a hole through the abyss to your destination using a teleportation matrix. Now, the Abyssal Services Department was created by the Wizard's Tower to administrate these in the early Fifth Age. How do they do this? All Matrices outside of the teleports available in modern spellbook are actively teleblocked.

Now, we all know there are a great many ways of teleporting that this spellbook does not include, including the other spell books, how would this work? You have to create a way around it. The Moonclan appear extremely skilled at doing this, though their methods are cost intensive. Zarosians(or what have you) appear to have another way entirely for reaching the same result(both have a teleport to Ghorrock, but they use different runes).

Now, my question: We know there are ways to prevent teleporting out of an area(there are so many examples, pick one), but are there ways to entirely prevent teleporting in? This would seem to be the case, I believe there are a few instances of this. However, if you knew the matrices that could still enter an area, and blocked those...it would be impossible to create another without getting into that area without creating the matrix from the end point(see the abyssal mage, he's holding open a matrix).

Anyways, your opinion, Roleplayers?