From PathfinderWiki

The Undercroft is an enclave of the city of Kalsgard, the de facto capital of the Lands of the Linnorm Kings. It lies under the city in its foundations, and many entrances to it are found in the Oak Quarter of the city. Many dwarves live in this underground quasi-district.1


  1. Matthew Goodall. (2011). Kalsgard. Night of Frozen Shadows, p. 66, 69. Paizo Publishing, LLC. ISBN 978-1-60125-366-8