Gatshadow Mountain is an enormous, ominous mountain in Tal'Dorei at the southeastern tip of the Cliffkeep Mountains, just northwest of the Bramblewood Forest and Westruun. Gatshadow's peak is nearly always obscured by storm clouds or mist. The actual stone that comprises this monstrous formation is of a darker, more dense stone that is considered to be the finest for crafting on Tal'Dorei's continent, hence why many crafters and smiths make the dangerous journey there to quarry the rock—and not all return.
Vox Machina journeyed to Gatshadow early in their adventures, delving into the mountain itself:
Umbrasyl's Lair Edit
After the Chroma Conclave attacked in Chapter 4, the ancient black dragon Umbrasyl roosted in a cave at Gatshadow's peak, receiving tribute from Westruun. Several scouting parties from the Herd of Storms were sent to Gatshadow in preparation for an attack on Umbrasyl, but they didn't return. Later, Shale and some other warriors from the herd scaled Gatshadow, as well. Shale's age and disabilities slowed her down, so she survived Umbrasyl's slaughter of her party by a twist of fate, then descended from the mountain in time to meet Vox Machina. Together, Vox Machina and Shale ascended Gatshadow and slew Umbrasyl in his cave.