South of the Lowlands was a vast sea with many continents and underwater cities. This was the last part of the Yggdrasil Tree and was considered the roots of this giant tree. This enormous and long winding sea spread out and reached the dark celestial body on which the Yggdrasil was planted.
The roots of the Ygdrassil were known as the Dark Sea. Despite the many years that passed, only about 40% of this region has been explored. It was the most difficult region to explore and a harsh region to inhabit. The Netherlands was even richer due to the potent dark energy in which it was made of. Yet, just like the Heavenly Planes, the Netherlands was the exclusive region for the strongest devilkins and monsters in the entire Planes World.