“Gemlocks?” “They’re not magical either but they were invented by dwarves. They’re gems that interact with other stones to create subtle vibrations. Gemlocks are generally used when several people need to open the same locked container. All they need is a matching gem. For particularly valuable containers, the lock might require a specific cut, which modifies the resonance. Truly gifted gemsmiths could make a lock that actually changed with the seasons, allowing different gems to unlock it at different times of the year. This is what gave rise to the idea of birthstones, because certain stones
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