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Originally Posted by malloyd
To be sure there sometimes are lasting spells that are enough easier they should have *some* effect (Shape Earth in GURPS, Continual Light in AD&D) but they're always in much more short supply than the "we can substitute magic for technology" proponents postulate.
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I don't believe I ever said that magic can substitute for technology; the disruption it causes is usually more complex than that (using magic for things that can be done at a reasonable cost through mundane methods is usually not worth it; it's where doing it by mundane means would be very expensive or impossible that magic jumps in). However, there are extremely disruptive effects that don't require very many magicians, and instant fortifications tend to be one of them.