2,000 years ago, Anos killed the God of Destruction Aberneyu and turned her body into the Demon King Castle Delsgade.
Delsgade is a three-dimensional magic formation, so even after 2,000 years it haven't changed much. Anos can only use Venuzdonoa while in the vicinity of the castle. Despite being repurposed into a school, Anos can summon his castle through magic.
- Despite not living in Delsgade anymore, Anos can still summon it to use Venuzdonoa.
- Web Novel Chapter 2