Master Key

Master Key is a 4★ weapon in Genshin Impact. It is a Claymore-type weapon.

Master Key was released on September 10, 2025. They were introduced alongside Moonweaver's Dawn, Snare Hook, Nightweaver's Looking Glass, Prospector's Shovel, Serenity's Call, Blackmarrow Lantern, suggesting they were part of the same content update.