RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: A red crystal
The Old School RuneScape Wiki also has an article on A red crystal.

A red crystal is what is formed in Ancient Lava Furnace after a lump of crystal, a chunk of crystal, and a hunk of crystal have been used on it. It is used on "Eye of the Dragon", a rock scenery that resembles a dragon eye on the minimap to produce glowing crystal.

Messages[]

Selecting the 'inspect' option:

As the crystal touches your hands a voice inside of your head says..
Voice in head: Bring life to the dragons eye.

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