As you clear the edge, you find a large altar at the center of the butte. The rest of the area is perfectly smooth, covered in obsidian, making the surface look like black glass. The windswept surface is free of dust and no mar lies upon its surface, yet within the glass lie runes and constellations. It is then that you realize that reflections do not appear upon its dark surface.
Jonathan Roberts, cartographer for Wrath of the River King and Adventures in the Hyborian Age, presents a Witch's Choice map: Black Sky Butte. This multi-page PDF allows you to print out the battlemap at a 1 inch=1 square scale as a letter-format map and is also available in a printer-friendly light grayscale version.
You can find more of Jonathan Roberts' work at his website www.fantasticmaps.com.