A Thassilonian relic from ancient times, the Spindlehorn is a fantastically tall structure located in the Wyvern Mountains of central Varisia. Thousands of feet in height, it rises from the shores of the Storval Deep, contradicting all natural laws of architecture and engineering. It is completely featureless except for a winding stair that winds like a corkscrew around its length, terminating in an open platform ten feet in diameter, thousands of feet above. The view from this platform is easily one of the most terrifying views in all of Golarion. The purpose of the spire has been lost to time, although it is told that dark-robed figures can be seen ascending, but never descending its heights from time to time.
- James L. Sutter. (2007). Varisia. The Hook Mountain Massacre, p. 67. Paizo Publishing, LLC. ISBN 978-1-60125-038-4
- Adam Daigle and James L. Sutter. (2012). Rise of the Runelords Anniversary Edition Player's Guide, p. 12. Paizo Publishing, LLC.
- Eric Boyd & Michael Kortes. (2008). People of the Storval Plateau. A History of Ashes, p. 71. Paizo Publishing, LLC. ISBN 978-1-60125-093-3