Keys & special Common
Copper Key銅の鍵
A crude key cast in copper. There should be a lock somewhere that it fits into.
In-game description
What is Copper Key? Features and uses
Copper Key is a common item in Core Keeper (Keys & special). It is crafted at the Key Casting Table from Copper Bar ×5. It can be obtained from Hive Dungeon, World Chest, Fishing in The Undergrounds (non-fish catches) and 3 other sources.
Copper Key key points (from the game data)
- Best source: Hive Dungeon — 9.1% chance per roll.
- Sells to merchants for 5 Ancient Coins.
Calculated and summarized by this site from the game data (1.3.0.6).
How to craft Copper Key (materials)
Crafted at
Key Casting Table What each crafting station makes →
| Material | Amount | How to get the material |
|---|---|---|
 Copper Bar |
× 5 | CraftingChest |
What you get from salvaging Copper Key (Salvage and Repair Station)
Copper Key can be salvaged. Salvaging it gives the following items.
For each material, the amount is "amount used to craft × 0.49 (lower when durability is down, 0.3 at 0 durability) × the item's multiplier", and a fraction is the chance of one more (2.4 means 2, with a 40% chance of 3). The range is from 0 durability to full durability (items without durability always count as full). Scrap parts are a fixed number set by the item level. All items that can be salvaged are listed in salvaging.
How to get Copper Key (Fishing, Enemy drop, Chests & pedestals, Breakable objects)
Fishing (1) Enemy drop (2) Chests & pedestals (2) Breakable objects (1)
| Source | Type | Biome | Amount | Chance |
|---|---|---|---|---|
| Fishing in The Undergrounds (non-fish catches) | Fishing | The Undergrounds | 1 | 2.4% |
| Orange Slime | Enemy drop | The Undergrounds | 1 | 1.2% |
| Red Slime | Enemy drop | The Undergrounds | 1 | 1.1% |
| Larva Hive Chest | Chests & pedestals | The Clay Caves | 1 | 9.1% |
| Chest | Chests & pedestals | Azeos' Wilderness, The Clay Caves, The Undergrounds, The Forgotten Ruins | 1 | 5.9% |
| Large Wooden Crate | Breakable objects | The Clay Caves, The Undergrounds | 1 | 2.1% |
"Chance" is the chance to get at least one of this item per try (opening one chest, defeating one enemy, one catch). A "guaranteed group" is the group of a chest or boss from which exactly one item always drops; it does not mean this item always drops (the chance of it being picked from that group is shown in small text). Only items that always drop are marked "Guaranteed". Fishing means catches with a fishing rod, separate from enemy and boss drops. Calculated from the game's drop tables (Conf/Loot, 1.3.0.6) the same way the game rolls them.
Other ways to get Copper Key
- Can come from the Chest found inside a scene (building, ruin, camp and so on) (5.9% chance per container)
- Can come from the Larva Hive Chest found inside a scene (building, ruin, camp and so on) (9.1% chance per container)Where: Clay Melody Room, Clay Caves Trap Puzzle [The Clay Caves]
- Placed in or on the Copper Chest found inside a scene (building, ruin, camp and so on) (guaranteed)Where: Clay Melody Room
- Can come from the Chest found inside a scene (building, ruin, camp and so on) (5.9% chance per container)Where: Abandoned Camp [Azeos' Wilderness], Hidden Clay Chest [The Clay Caves], Small Islands [The Clay Caves, The Forgotten Ruins], Hidden Turf Chest [The Undergrounds]
Scene containers, dungeon placements, guaranteed drops and natural spawns are based on the Obtaining data of the Core Keeper Wiki (Fandom) (CC BY-SA 3.0), because these are not in the game files this site reads. Scene names are the wiki's English names.