King Neptune is a Quest NPC who provides progression related quests to players. Interacting with him allows players to accept specific objectives needed to advance through the associated part of the game.

Location:

King Neptune is located in the Underwater City, standing in front of the coral formations to the right of the Fishman Warriors. His position makes him easy to find while progressing through the area's quests.

Quest:

King Neptune offers the Underwater City questline for players between Levels 375 and 425, providing a steady source of Money and EXP while progressing through the late First Sea.

• The first quest requires defeating 8 Fishman Warriors at Level 375. It rewards $8,750 and 3,050,000 EXP, making it the starting point for leveling in the area.

• After reaching Level 400, players can accept a quest to defeat 7 Fishman Commandos. Completing it grants $9,000 and 3,350,000 EXP, offering improved rewards against stronger enemies.

• At Level 425, King Neptune assigns the Fishman Lord boss quest. Defeating the boss rewards $15,000 and 4,250,000 EXP, marking the final quest in the Underwater City progression.