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Short answer
Look for a dark circular patch of sea south, slightly southwest, of Mel’s shell house. This is the location given by the accepted player answer. The questioner confirms it solved their search after they had mistakenly focused on the small rescue island.
Already at the darkest-sea objective? Start with the landmark below. If your journal still asks for food or a boat, complete the earlier stage first. The location is player-confirmed; the wider progression below is written-guide evidence, not our own playthrough.
Before searching: food, boat and Hymn of Sea’s Abyss
Fextralife’s quest guide and Neoseeker’s song guide agree on this order:
- Bring Azara 4 Spring Tubers and 4 Rhubarb.Speak to the lighthouse keeper with harvested vegetables in your inventory. Seeds are not the requested food.
- Return after obtaining a boat.If the journal says to come back with a boat, searching the water is premature.
- Check that Hymn of Sea’s Abyss is in your song list.Azara teaches it for this search. Song of Silence belongs to a different quest.
The Development Build video narration at 24:51–25:15 also describes delivering crops and being asked to return with a boat. It does not verify the later temple sequence or current-release crop quantities.
Use the shell house as your reference point
- Orient yourself from Mel’s shell house, rather than starting at the island where Mel was rescued.
- Search the water to its south and slightly west for a visibly dark, circular area.
- At the dark patch, play Hymn of Sea’s Abyss. The written guides identify this song; the Steam answer independently confirms the location. Follow your in-game score and bindings.
Recognize the shell-house landmark
Find Mel and Lusina’s shell before searching the water to the south.
- Look for this
- The large pink shell building on the rocky shoreline shown here.
- Before moving on
- You are oriented from the shell house, not the small island where Mel was rescued.
- If it does not match
- This frame does not show the dark patch. Do not treat its water as the casting target.
If the landmark is unfamiliar, see the shell-shop approach and fishing-rod guide.
Try searching in early daylight if the contrast is hard to see. A new independent player reply recommends boating south of Mel and Lusina’s shell early in the day, then looking for water slightly darker than its surroundings. This corroborates the general search area; daylight is a visibility suggestion, not a verified quest time requirement.
If the location still does not trigger the objective
Compare your active journal step with the darkest-sea clue before treating this as a bug. The Steam location answer does not establish exact coordinates or travel controls. The prerequisite checklist above comes from the linked written guides. If the objective is active and casting still has no effect, include your journal step, position and game version in a report.
Searching after you already played the song? A new follow-up says the dark patch disappears once the song has been played there. Check your journal for the next objective before searching for that same visual marker again. This is one player’s explanation, not independently tested behavior.
At night: one player reports finding the spot with a lantern, but another says they had a lantern and still could not find it. Light is not a confirmed fix or a demonstrated quest prerequisite. The linked video shows only the shell-house landmark, not the target itself.
What should happen after casting?
A sea temple should rise. Both written guides describe this result. If no temple appears, check the song and your position before looking for the next quest item.
Quest spoilers: the item inside and the return trip
Fextralife describes speaking with the statues inside and collecting the Gross Garment, then choosing whether to give the hat to Rowan or Azara. Its listed reward is 5 XP; haggling with Azara before handing it over adds 400 gold petals. This ending information is a written-guide report, not independently replayed here.
For trouble entering instrument mode, see manual flute controls. Follow the Hymn’s own score rather than the Song of Silence notes on that page.
Version and sources
Rechecked 15 October 2026: the two Steam location discussions and both written guides. The sources agree on the prerequisite chain and temple outcome, but this is not independent gameplay verification. No new dark-water or temple screenshot has been verified.
Direction and successful resolution come from the Lighthouse Keeper’s Quest Steam thread, with no build number stated. This is a player-confirmed location answer, not our own playtest. The landmark reference links to The Cozy Gaming Club’s 30 September Development Build video, recorded with a supplied key. It is not a current-release walkthrough of the full quest.