The Ocean domain was a deity domain that granted divine spellcasters like clerics with oceanic-themed spells and powers. They gained the ability to breathe underwater for several minutes to several hours.
Novice spellcasters were able to use the endure elements, sound burst, and water breathing spells. Clerics of some experience could cast freedom of movement, wall of ice, and otiluke's freezing sphere. Those that were masters in this domain had access to waterspout, maelstrom, and water elemental swarm.