Ahghairon's dragonward was a powerful & undispellable mythal cast by the famous mage Ahghairon over the city of Waterdeep. It projected a dome 25,600 ft in diameter, which encompassed the city's borders in their entirety. #dnd #WaterdeepWednesday https://forgottenrealms.fandom.com/wiki/Ahghairon%27s_dragonward