Aetherium Hearts
Idle dungeon RPG and its tales
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Each bard's air now has its own tune, and a song plays by the campfire. Watch your adventurers dive, read their tale, send them back down: an idle dungeon RPG.
Raise adventurers in Selwyn, town of the Ash Marches, and send them down into the labyrinths. The expedition runs by itself — they walk, they fight, they gather, and sometimes they fall. Those who come back bring the whole of it with them, written up by an AI as a single tale. No two are ever the same.
◆ Three labyrinths
The Ashen Corridor, the Frostcrystal Archive, the Ember Crucible. Each runs to a different depth and a different danger, and at the bottom of each an Aetherium Heart lies sleeping.
◆ It runs on its own
Once they are down there, they walk and fight on their own feet. The descent continues while the app is closed.
◆ Tales
The record of a returning expedition is woven into prose by an AI. Send it straight to X, Threads, Bluesky or Discord.
◆ The town and your company
An armoury, a general store, a forge, the guild, a temple, a shrine — Selwyn holds nine places to go. You can also go looking for an adventurer who has gone missing.
◆ Standings
Set the Aetherium Hearts you have offered at the Shrine of Astel against every adventurer in every town.
Japanese and English, switching with your device. Free to play, with no in-app purchases.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- The bard's airs now have music. Turn on "Play music" in the guide to hear it while an air is playing and while the party is camped.
- An ad banner now appears at the top of the screen.
- Once every 12 hours you can watch a video to revive, unpetrify or buy leads without gold.
The developer, Hitoshi Igarashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- User Content
- Identifiers
- Usage Data
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hitoshi Igarashi
- Size
- 57.6 MB
- Category
- Roleplaying
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- Japanese
- Age Rating
13+
- 13+
- Frequent
Cartoon or Fantasy Violence
Contests
Guns or Other Weapons
Infrequent
Mature or Suggestive Themes
Horror/Fear Themes
Contains
Advertising
User-Generated Content
- Copyright
- © 2026 Hitoshi Igarashi
