Shalazad, The Abbey of the Silent Bliss

Rumored to be in the Mere of Dead Men on the Sword Coast, Shallazad, The Abbey of Silent Bliss stood over 200 years ago when the Mere of Dead Men was a rich farmland until an eruption of arcane energy from the nearby Sword Mountains destroyed the area and turned it into the cursed swamp it is today.  They rubble and overgrown ruins are all that is left of the abbey. When the sun sets, the abbey phases into existence and brave adventurers may enter but they only have until sunrise to leave or face being trapped within its walls until the following sunset.