Publisher's blurb: The High Magic Sourcebook introduces all-new mechanics for high magic, epic spells, circle magic, and spellsinging, to make the magic system for fifth edition Dungeons & Dragons more chaotic and powerful than ever before. Marshal unimaginable energy with cooperative spellcasting and feed an empire—or erase your enemies from existence. New subclasses and a slew of new spells, magic items, downtime activities, and creatures support the high magic mechanics, making it a living, breathing part of the Forgotten Realms campaign setting. This book also offers guidelines for adapting these rules to Eberron, Strixhaven, and other D&D worlds.