See "Tyrants In Scarlet" at the DM's Guild (free pdf download) for the full tale. The Athora is a castle-sized hunk of alien rock under Thaymount that enhances mastery of the Art and cast spells and enchanted items. So, largely responsible for the Red Wizards of Thay.#Realmslore
— Ed Greenwood (@TheEdVerse) May 26, 2019