The Pearl Citadel: The heart of Kainoa is where Priestess Ailani resides, housing the Aqualabium, a heavily guarded cursed artifact.
The Luminous Gardens: Glowing coral reefs that provide food and light to the city, and a gathering place for merfolk.
The Wreck Market: A sunken cavern filled with shipwrecks, where desperate merchants and traders barter for supplies.
The Aqualabium Heart Vault: A hidden vault deep within the Pearl Citadel, containing the Aqualabium, the source of Davejazali' power over the city.

Davejazali: The undead tyrant who controls Kainoa, seeking to expand his rule across the seas. His power over the city is tied to the Aqualabium.
Priestess Ailani: The former leader of Kainoa, now a puppet under Davejazali' control, but still viewed as a symbol of hope by many.
Captain Makoa: Commander of Kainoa’s Guard, a loyal but pragmatic soldier who is secretly plotting to overthrow Davejazali.
Sorceress Hina: A local figure, secretly loyal to Davejazali, who runs the Salty Squid Inn and gathers information.
Sailor Koyana: A kenku parrot adventurer, and a friend of dragon turtle Namu, rescues the PCs.

The Vortex Scourge: Davejazali' personal army, composed of cursed pirates and sea creatures enforcing his will, including sahuagins, chuuls, dire sharks, or even an aboleth and plesiosaurus.
Kainoa Residents: The native merfolk, longing for freedom, who are beginning the PCs for help.

Aboleth - CR 10
Ancient Sea Serpent - CR 18
Cave Kraken - CR 21
Chuul - CR 4
Dragon Turtle - CR 17
Giant Dire Shark - CR 7
Giant Sea Horse - CR 1/2
Merfolk - CR 1/8
Pirate - CR 1/8
Plesiosaurus - CR 2
Sahuagin - CR 1/2
Sahuagin Mage - CR 1