A glass candle is a candle made of obsidian. Historically they burned, but they have not been reported to burn in recent memory.
What is the significance of the glass candle in ASOIAF? - Quora
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Glass candle, Wiki of Westeros
What is the significance of the glass candle in ASOIAF? - Quora
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🧙♂️ What are glass candles?
What is the significance of the glass candle in ASOIAF? - Quora
Hardened Glass – Minecraft Wiki
What is the significance of the glass candle in ASOIAF? - Quora
Because nobody 𝑒𝑣𝑒𝑟 suspects the butterfly — franniesart: ⌜The Glass Candles are