The Altum Sea stretches far into the uncharted regions of the Miasma. As a result, most denizens of the Relief tend to have at least a rudimentary understanding of seafaring or aviation. The destruction of Mundi Eversor wrought great storms that filled the cavities left behind after the Rising, leading many aquatic races to take refuge in its depths.
The largest congregation of sea-folk in the Relief resides at the bottom of the Vena Trench. This mysterious underwater city has been named Abyssus by explorers that have until recently only inferred its existence. Not much is known about the city, other than it lies west of Mundi Eversor.