Headband of miner intellect:
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Forged by a dwarven artificer who lost too many colleagues due to their lax attitude around safety.
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Anyone wearing this headband becomes aware of the quality of air and props for whatever tunnel they're currently in.
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Wearers possess an intrusive urge to find proper protective equipment before attempting a task.

"If You Tolerate This Your Children Will Be Next." By the Manic Street Preachers.