The vast, mysterious depths of Enkanomiya have been a staple of Genshin Impact exploration ever since Version 2.4 dropped back in 2022, and even now in 2026, fresh-faced Travelers still find themselves scratching their heads over the infamous “Break the Final Seal” objective. If you're looking to descend into the sunken realm of Watatsumi Island, you'll need to complete the Moon-Bathed Deep quest series, snag four Spirit Pearls, and ultimately claim the Key of the Moon-bathed Deep. Don't sweat it—this guide will walk you through the whole shebang, from triggering the quest to dealing with that pesky cave bug, all with a few pro tips picked up along the way.

Starting the Moon-Bathed Deep Quest Series

First things first: you've got to kick off the quest by chatting up Tsuyuko, a sharp-eyed shrine maiden hanging out near the Statue of the Seven at Mouun Shrine on Watatsumi Island. As you approach her, a huge blue exclamation mark will pop up on your mini-map—can't miss it unless you're playing blindfolded. She'll task you with visiting four sacred sites scattered across Watatsumi, each guarded by a puzzle that rewards you with a Spirit Pearl. Straightforward, right? These four quests—Eye of Watatsumi, Fang of Watatsumi, Fin of Watatsumi, and Tail of Watatsumi—are clearly marked in your quest log and come with in-game hints that make solving them a breeze. Even the clunkiest puzzle solver will be saying “easy peasy” by the end of it.

Collecting the Four Spirit Pearls

Each mini-quest has you interacting with mechanisms tied to the Watatsumi lore. At Eye of Watatsumi, you’ll rotate stone pillars to match a pattern shown on nearby ruins. Fang of Watatsumi demands you light torches in a specific order while dodging some annoying Hydro slimes. Fin of Watatsumi introduces the iconic fish statue puzzles—rotate them so all three fish face the central disc. Tail of Watatsumi? Think of it as a remixed version where you’re guided by ancient text carved into the walls. No need to overthink it; the game holds your hand just enough to keep you from rage-quitting. Once you've bagged all four pearls, Tsuyuko will mark the final location on your map: the Heart of Watatsumi.

Entering the Heart of Watatsumi Cave

Head to the shimmering blue door nestled in the cliffs—pop the four Spirit Pearls into the slots, and you're in. The cave entrance might be slightly hidden, but trust the marker. As you step inside, the atmosphere shifts: glowing coral, ancient pillars, and a series of puzzles that mirror the ones you tackled at Fin of Watatsumi. Only this time, the stakes are higher—you're on the verge of snagging that coveted Key.

How to “Break the Final Seal” – Step-by-Step

Now comes the meat and potatoes of this guide. Inside the cave, you’ll spot four distinct puzzle stations, each sporting three fish statues. The trick is to rotate each fish until they all face the glowing disc in the center. It’s a classic case of “spin to win,” but there’s a catch: the game wants you to tackle the three front puzzles first and leave the one at the deepest part of the cave for last. I’ve seen plenty of Travelers go ham and do them in random order, only to be slapped with confusion—so stick to the plan.

Here’s a quick walkthrough:

• Step 1: Find the first puzzle near the entrance. Rotate the fish statues one by one. If you mess up, no biggie—just keep spinning until they line up. Once they’re all pointing inward, the puzzle locks, and a gang of Hydro Mimics spawns. This is where a Cryo character like Ayaka or Ganyu becomes your BFF. Freeze those slippery blighters and go to town. After the fight, interact with the Mysterious Pillar to permanently lock the puzzle.

• Step 2: Repeat the process for the second and third puzzles. The layout is nearly identical, so by now you’ll be speed-running this part like a pro. Keep your party well-fed and your bursts charged—those mimics can be a real pain if they get the drop on you.

• Step 3: Head to the fourth puzzle at the cave’s far end. This is the “final seal” that the quest objective keeps harping on about. Do the exact same fish-rotating dance, obliterate the Hydro mimics, and lock the puzzle via the pillar. Once that last pillar is activated, a cutscene will trigger, and the Key of the Moon-bathed Deep will manifest right in the center of the cave, surrounded by a cool ethereal glow. Claim it, and you’re golden.

The Dreaded Bug: When the Final Seal Won’t Break

Back in the early days of Version 2.4, a handful of unlucky players ran into a game-breaking bug where the puzzles in the cave straight-up refused to trigger, leaving them staring at a stagnant “Break the final seal” objective. Even in 2026, while HoYoverse has squashed most of the gremlins, I still hear whispers of this issue cropping up in rare instances. If you find yourself stuck, don’t panic—teleport to a distant waypoint, log out and back in, then return to the cave and redo the puzzles. Usually, that does the trick. As a safety net, make sure your adventure rank and world quest progress are fully up to date; sometimes outdated game cache can cause hiccups. If all else fails, ping customer support—they’re surprisingly responsive these days.

Getting to Enkanomiya Like a Boss

With the Key of the Moon-bathed Deep now tucked in your inventory, you’re ready to unlock Enkanomiya. The lore dictates that the entrance is the luminous pool right in front of the Sangonomiya Shrine. Simply approach the pool, interact with it, and the key will part the waters, granting you access to the submerged city. Remember, back in 2.4 there was an extra step—completing The Still Water's Flow quest—but nowadays that’s bundled seamlessly, so you can jump straight in. The moment you descend, the world map expands, and a whole new realm of puzzles, bosses, and breathtaking visuals awaits.

Pro Tips and Tricks for a Stress-Free Experience

• Team Comp: Bring a Cryo DPS and a reliable healer. The Hydro Mimics are the real gatekeepers here; freezing them trivializes the fights. Characters like Kokomi or Barbara can keep you topped up if things get hairy.

• Co-op Mode: If you’re really struggling, don’t be shy—call in a friend. The puzzles themselves are solo-only, but the mimic battles become laughably easy with a second player dropping nukes.

• Map Awareness: The cave can feel like a maze, but at its core it’s a simple linear path. Just follow the quest markers and you won’t get lost.

• Save That Key! The Key of the Moon-bathed Deep is a permanent quest item, so you don’t need to worry about accidentally trashing it. Still, it’s satisfying to see it sitting pretty in your inventory.

Why This Quest Still Matters in 2026

Even with several regions released since Inazuma, Enkanomiya remains a fan-favorite destination for its dark, melancholic aesthetic and rich lore. Completing the Moon-Bathed Deep quest isn’t just a rite of passage—it unlocks a trove of primogems, exclusive weapons like the Oathsworn Eye, and materials needed for characters such as Shenhe. New players and reroll accounts still flock to Watatsumi Island each month, making this guide as relevant as ever.

In a nutshell, nailing the “Break the Final Seal” objective is about methodically clearing each puzzle, keeping a cool head against Hydro Mimics, and having the patience to deal with the occasional bug. Follow these steps, and you’ll be strolling through Enkanomiya’s eerie corridors before you can say “Primogem haul.” Happy exploring, Travelers—and may your artifact rolls ever be in your favor!