Spellcasting at Sea

Spells Underwater

• Spells requiring verbal components and 1 action, reaction, or bonus action to cast, use up 1 minute of air.
• Remember visibility is often very poor underwater
• Everything else just works. Fireballs underwater? But how? MAGIC! Does it boil the water? Nope, Magic.

Spells against ships

Creatures can attack ships with spells. Ships are somewhere between creatures and objects, sort of like constructs, so spells will often affect ships in different ways or in some cases, not at all. However, because a ship is actively crewed and piloted, it can make saving throws against spell effects. Ships are immune to most spells that require a mental (Intelligence, Wisdom, Charisma) save. The DM has information to cover these situations as they arise.

Special Spells

A document containing some flavorful, campaign-specific homebrew spells can be found here.