|“||A key covered in rust. We got it from a chest in the Carnea District.||”|
|“||A key covered in rust. It opened the rusty door in the Carnea District.||”|
Acquirement: From the first room of Stage 4's Carnea District, go right twice, have either Cierra, Fia, or (preferably) Serene stand on the plate. Next, go right again and open the green chest for the Rusty Key.
Function: Required for progression. Opens the Rusty Door to escape the Carnea District.