Aenshin

This enormous Elder Dragon preserved the Sacrosanctum's ecosystem 200 years ago, earning it the title of "Sentinel," but it vanished after the Sacrosanctum was destroyed during the Rift War.

Crystallizing Capacity: After devouring battle-bound monsters during the war 200 years ago, this monster gave rise to the Crystal Encroachment. Traces of its existence have begun reappearing over the last decade.

Catalyst of Devastation: While this monster preyed on the Sacrosanctum's enemies and helped it prosper, it also sought to eliminate the battle-bound monsters used in the Rift War, leading to the Sacrosanctum's destruction.