|This article is about a/an item in Garo: Honoo no Kokuin|
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A Madou Bell is an ancient device used by Makai Knights and Priests in the past to detect Horrors. The tool was developed by Makai Preist Gael decades before the anime's events when he was a young child. The bell emits a sonic vibration that causes the eyes of the possessed to glow a lavender color. The sound also can travel a certain distance, allowing a Makai Knight to find a Horror in a crowded area. The reason Madou Bells existed in this time period is because Madou Lighters were not invented yet. It is presumed they were discontinued from use when Madou Lighters were created, as they lack any offensive or healing capabilities, being mere Horror detectors.
- The tools form as a bell is based on Dead Bells of the Middle Ages and myths about bells being able to protect its wearers from evil.