Players will come across dozens of chests while exploring in Atelier Yumia: The Alchemist of Memories & the Envisioned Land, and while many are unlocked and the only challenge is finding them, there are others that cannot be opened unless gamers lockpick them or unseal them.

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At Dux Lighthouse, there are two chests, one must be lockpicked, and there other is sealed. This guide will show players how to unseal the chest at Dux Lighthouse in Atelier Yumia and acquire the rare loot inside.

How to Open the Sealed Chest at Dux Lighthouse in Atelier Yumia

hitting switch atelier yumia

Players will most likely come across the sealed chest at Dux Lighthouse while exploring Manabound Area 1 to collect scrap so they can make the Repair Kit to access the lighthouse.The chest is located on the groundfloor of the small building east of the lighthouse, and it will get the attention of most players due to the bright colored seal surrounding it.

To open the sealed chest at Dux Lighthouse in Atelier Yumia: The Alchemist of Memories & the Envisioned Land, players must activate the three switches hidden in the building by shooting them.

Where to Find the Switches at Dux Lighthouse in Atelier Yumia

dux lighthouse switch A atelier yumia

The switches can be easy to miss, as some areas inside the building are quite dark. The first switch is directly above the sealed chest, high on the wall. Players must press the Aim button and then shoot it so it turns blue.

Next, players must jump onto the wall and then double jump so they can reach the floor above, which is where the other two switches are located.

There are two boarded up windows on the top floor, and there is a trigger above each one. Players must shoot at each trigger from a distance, and they will turn blue. Once all three switches have been hit, the sealed chest will be unlocked, and gamers can go up to it to get their reward.

Reward for Opening the Sealed Chest at Dux Lighthouse in Atelier Yumia

treasure trove key atelier yumia

Inside the groundfloor chest near Dux Lighthouse, there is a Treasure Trove Key, which can be used to access Treasure Troves at various locations.

The Treasure Trove Key can only be used once, so gamers must use it wisely if they don't have many of these items to spare.

There is also a chest on the higher floor of the building, which players must lockpick to access, and inside there is Prosperous Spellbook.

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Atelier Yumia: The Alchemist of Memories & the Envisioned Land
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Released
March 21, 2025
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WHERE TO PLAY

DIGITAL
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ESRB
Teen // Fantasy Violence, Mild Blood, Suggestive Themes, Mild Language
Developer(s)
Gust
Publisher(s)
Koei Tecmo
Franchise
Atelier
Number of Players
1
Steam Deck Compatibility
Unknown
PC Release Date
March 21, 2025
Xbox Series X|S Release Date
March 21, 2025
PS5 Release Date
March 21, 2025
Nintendo Switch Release Date
March 21, 2025
Genre(s)
JRPG, Crafting, Action
X|S Optimized
Yes
Atelier Yumia preview