human
Produce a detailed written description of a mystical scene outside a mountain pass with elven runes and a sigil of warding.
assistant
The jagged black mountains for which this pass is named jut to the east and west, just barely allowing passage for the north-south road. A guard house is situated beside the path, looking as if it were melting out of the mountainside. Elven runes are cut into the walls, and a sigil of warding has been carved over the doorway.