Michael Hastings's page

Did a write up of the Kakamora. Take the goblin race. Three levels of rogue archetype pirate. Change out the language to kakamora. Add wooden armor. Harpoon and blowgun weapons. Two feats roll with it and exotic weapon (harpoon). Make sure they have points in the skills performance (percussion), climb, acrobatics, profession (sailor), and swim

Here is an interesting idea "Archetypes - Archives of Nethys: Pathfinder RPG Database" https://aonprd.com/ArchetypeDisplay.aspx?FixedName=Spiritualist%20Drowned%2 0Channeler Drowned Channeler. The visuals alone is worth the encounter

Wereshark anything is a good choice :)

My campaign background takes place a few years after the events in the cartoon. King Ren has taken his place in the Wave Throne. One of the first things he has done is declared war on the pirates. The Merchants Guilds are financing his fleet building. Bloth stands alone. He has made to many enemies and the other pirate captains blame him for King Ren's destruction of several known Pirate ships. Morpho and his cult have a high bounty on his head and has had to keep on the run. King Ren only has 7 of the treasures and still seeks the others

If you are willing to make a serious investment. The Freeport campaign for Pathfinder is an excellent source for Pirate campaigns. The have a playable race called the Va'al it describes Bloth perfectly

Also. Look up Black-blooded creature template. You can add it to an ooze. If you go that direction. Morpho becomes a https://www.d20pfsrd.com/classes/base-classes/oracle/archetypes/paizo-oracl e-archetypes/black-blooded-oracle/

Here is thought about the Dark Water. Thinking of its nature and possible origin. All the dead stuff that sinks to the bottom. Add a touch of necromancy. Now you have an undead ooze that is being slowly guided by something. Also, you can control the hit dice to match the encounter.

For the treasures. Yes, looks and acts just like a magic item. Until you start to Identify it. Follow the rules about the Identify spell and Artifacts. That is why Ren's compass is important. Only way to find the Treasures.

I have a few notes (not complete) from long ago. I don't mind sharing if anybody is interested.

Here is a page you might want to check. http://piratesofdarkwater.net/buriedtreasure/worldbook/01.html

I know it has been awhile. Did you ever get your game off the ground?