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Originally Posted by AdmiralTigerclaw
Part of such a defensive measure, is if the enemy can teleport in, have teleport barriers ready. If the enemy tries to come in, you pick up the signature and snap up a barrier. Barring the way.
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An anti-teleport-in barrier appears to require a lot of power. Clinque blowing up the generator in GFHQ in ep16 only reduced the output of the defensive barrier. Yet, that was enough to allow Lutecia to teleport the army of Gadgets in. Lesser barriers cast by mere mages in the first two season have been consistently shown to be unable to prevent hostile entry, although they're better at preventing hostile exit. This also requires a mage to be in position to cast a barrier to trap an incoming teleport in the first place. The TSAB hasn't shown the ability to remotely cast barriers tens of km away or more, ever.
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The wide area barrier seems to be a decent backbone of mages at least early on in the series before we got to strikers...
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For the first two seasons, the purpose of the barriers was to keep the people of Earth from finding out about magic. That's no longer a concern when the action takes place on Mid instead. Also, I vaguely recall someone talking how casting those barriers ties down mages that could otherwise assist in stopping the threats inside the barrier.