To gain access to the Merfolk Kingdom, you must progress through the "Into the Ocean" questline. The journey begins once you activate your first solar orb and successfully reach a depth of 10 meters. As you continue to purify the waters by clearing 20 orbs across the Bronze and Silver kelp zones, the "One of Us" quest will trigger, prompting you to meet the Merfolk at his palace. Reaching the kingdom at a depth of 20 meters opens up new romanceable characters, unique shops, and pivotal lore regarding the island's guardian spirits.
