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I should mention that in the very unlikely event you should ever find yourself enslaved, jailed, or otherwise captured as a magic user, all shackles, cuffs, and other restraining devices are equipped with a small stone embedded somewhere in the device colloquially called a "loadstone". Unlike the stones we are familiar with, slightly magnetic and not much else, these are magic dampening crystalline minerals similar to a focus. Any magic attempt to cast will be absorbed and dissipated as heat, a lot of heat, enough to make you never consider doing that again.
Fun fact, magic arrows of silence have a loadstone embedded in the tip and the tip breaks off when it strikes causing the one hit to lose the ability to cast or suffer fire damage to self and no other intended effect. It's very fun at the college of magic frat parties.
That is all.