Along the Nars pass
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Up and down the Nars pass, wanderers passing the crystals will see planks of wood before each crystal with a tar painted warning in Common: "DO NOT TOUCH THE CRYSTALS!" Each is accompanied by an illustration of a human, dwarf or half-orc burning while touching a crystal.
Word has it that the signs were put in place by Genzir, Rognar, Raisa, and Wolf.
((double the post, double the fun))
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At the risk of nit-picking, the signs actually read:
Do not touch the black crystals
The sign in Jiyyd is just inside the gate, to the left of the path, near the pumkins. The picture below the text is of a large half-orc with a great-axe touching a crystal and being burned by it.