How to open a locked chest
Insert the matching key
Interact with the chest and place the matching key in its key slot. It opens and becomes a normal chest you can take items from.
Craft keys at the Key Casting Table
Copper through relucite keys are crafted at the Key Casting Table. You need the key made of the same metal as the chest.
Found while digging
Locked chests occasionally turn up while you dig, with the type matching the biome.
List of locked chests and their keys
| Chest | Key | Where the chest is found |
|---|---|---|
 Locked Copper Chest |  Copper Key | Fishing in The Undergrounds (non-fish catches) |
 Locked Iron Chest |  Iron Key | Fishing in The Forgotten Ruins (non-fish catches), Fishing in The Clay Caves (non-fish catches) |
 Locked Scarlet Chest |  Scarlet Key | Fishing in the Mold area (non-fish catches), Fishing in Azeos' Wilderness (non-fish catches) |
 Locked Octarine Chest |  Octarine Key | Fishing in The Sunken Sea (non-fish catches) |
 Locked Galaxite Chest |  Galaxite Key | Fishing in the lava area (non-fish catches), Fishing in The Desert of Beginnings (non-fish catches) |
 Locked Solarite Chest |  Solarite Key | Fishing in The Shimmering Frontier (non-fish catches) |
 Locked Relucite Chest |  Relucite Key | See how to obtain |
 Locked Desert Queen Chest |  Azeos Feather Fan | See how to obtain |
 Locked Desert King Chest |  Omoroth Compass | See how to obtain |
 Locked Desert Prince Chest |  Ra-Akar Automaton | See how to obtain |
Each chest's page lists its contents with the chance per opening. For key recipes, see the list of keys.
How to open a locked chest (step by step)
- Check the chest type: the metal decides the key. A locked scarlet chest needs a scarlet key, for example.
- Get the key: craft it at the Key Casting Table (chests opened with boss treasures need the item from that boss).
- Interact with the chest and put the key in the slot: it becomes a normal chest. The key is used up.
Mechanics from the Core Keeper Wiki (Fandom) pages "Chests", "Keys" (CC BY-SA 3.0), summarized in our own words (not confirmed in the game files).
Unless a note on the page says otherwise, numbers are read from the game files of Core Keeper 1.3.0.6 (prefabs, configuration files, drop tables and the game's program) and calculated by this site, including upgraded (per-level) values, sell prices and mana costs. Names and descriptions are the game's official English text. Only reinforcing materials, minion and pet attacks and some food values are based on the Core Keeper Wiki (Fandom) data (CC BY-SA 3.0). Core Keeper and its images are © Pugstorm. This is an unofficial fan site.