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From Fire Emblem Wiki, your source on Fire Emblem information. By fans, for fans.
The Chest Key (Japanese: 宝の鍵 Treasure Key) is a fairly common item in the Fire Emblem series, first appearing in Mystery of the Emblem, having appeared in every game from Thracia 776 onward with the exception of Shadow Dragon and Echoes: Shadows of Valentia. It allows any unit to open chests, when normally, only thieves can do so. Their durability and price changes according to the game; the Chest Key has ranged from a single-use item to having 20 uses.
Mystery of the Emblem
The Binding Blade
The Blazing Blade
||Hector's tale: Legault (×2)
||Eliwood's tale: Chapter 16, enemy Archer • Chapter 19, enemy Knight (Normal only) • Chapter 25, enemy Sniper (Normal only) • Chapter 25, enemy Druid (Normal only)|
Hector's tale: Chapter 17, enemy Archer • Chapter 20, enemy Knight (Normal only) • Chapter 27, enemy Sniper (Normal only) • Chapter 27, enemy Druid (Normal only) • Chapter 30, enemy Thief (×3)
||Hector's tale: Chapter 19x pt2, enemy Thief
||Eliwood's tale: Chapter 19* • Chapter 21*|
Hector's tale: Chapter 20* • Chapter 22*
The Sacred Stones
||Chapter 3, enemy Brigand • Chapter 5x, enemy Mage, enemy Fighter • Chapter 9B, enemy Mage • Chapter 11A, enemy Bonewalker (×3) • Chapter 14A, enemy Knight • Chapter 14B, enemy Shaman • Chapter 16, enemy Druid*, enemy Shaman* • Final Chapter, enemy Wight
||Port Kiris • Bethroen
Path of Radiance
New Mystery of the Emblem
||Birthright: Chapter 9, enemy Outlaw • Chapter 16, enemy Knight*/General*, enemy Knight, enemy Hero, enemy Fighter • Chapter 19, enemy Sniper, enemy Hero • Chapter 25, enemy Sorcerer (×3)|
Conquest: Chapter 14, enemy Shrine Maiden • Chapter 20, enemy Spear Master
Revelation: Chapter 7, enemy Archer (×3), enemy Spear Fighter, enemy Knight, enemy Cavalier • Chapter 8, enemy Archer (×2) • Chapter 9, enemy Oni Savage, enemy Archer • Chapter 15, enemy Diviner, enemy Samurai • Chapter 20, enemy General (×2), enemy Berserker • Chapter 21, enemy Adventurer, enemy Sniper, enemy Maid (reinforcement) • Chapter 22, enemy Great Master, enemy Falcon Knight
BS Archanea War Chronicles
Etymology and other languages
|Names, etymology and in other regions
||Definition, etymology and notes
||• Chest Key
• Treasure Key
|• Used in the main series.|
• Used in Tokyo Mirage Sessions ♯FE.
|Treasure key; different spellings are used in different games.