[Gandalf Parker]

I like the idea of Charybis (wandering whirlpool). Kindof like a water version of Eater of the Dead.

Global Warming spell?
All shore provinces become susceptable to hurricanes, flooding of inland water provinces, global food supplies go down, and maybe temperature shifts? National spell? global spell?

Riotous Reefs
Blocks all ship traffic. Seagoing Nations are docked, Mercs, equipment, etc. Also increases food supplies in water provinces.

Holy Water
Gives water a semi-blessing vs undead.
Not sure if this should be a global, national, or province or battlefield. The effect could be instant and major damage or something along the line of the thing in the game that keeps telling you that your undead units in a certain province have taken damage.

Coral Castle
Like the one creating the kelp castle but stronger

Humidity
(better name needed). Improves the abilities of amphibious while on land. Global? National? Battlefield?

Grindylows
These water demons were first mentioned in British folktales in the county of Yorkshire. Parents told their children stories of grindylows to prevent them from getting in the cold water in the area. Grindylows supposedly had long fingers that would drag children into the deep.
Lowers population in coastal provinces? Could be Oceanias initial action to less the power of nations keeping it from getting onto shore.