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... detect intruders is that it cannot be as dense as a net.
If it were, each line of the barrier would interfere with the others, causing a contact reaction.
Thus, it was common for there to be gaps large enough for one person to slip through.
Of course, even constructed this way, it wasnt a significant problem.
It was rare for someone to precisely perceive the mana flow connected to the barrier.
There are devices designed to search for it, but they are bulk ...
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