Ignatious: The Great Stone Wyrm

From publisher blurb: Darkness. Nothing but darkness. Eons have passed in the world above. The Wyrm of Stone has slept silently in his prison for centuries since an age long forgotten. Suddenly: stones shift, rocks shake and fissures begin to form in the walls. A slumbering eye opens. He has awoken. Ignatious (CR 20) is a mighty elemental stone wyrm intent on destroying all of civilization. This book is fully illustrated and written for 5e campaigns. It features a new boss monster that includes details about the boss's back story, personality, and tactics.