A Code Key (コードキー, Kōdo Kī) is a mystical cardkey-like artifact that appears in Digimon Savers: Another Mission. Each of the seven Code Keys can be used to transform someone exhibiting a deadly sin into one of the Demon Lord Digimon corresponding to the crest depicted on that Code Key.
The Code Keys each have Digimoji displayed on the back which reads "THE SEVEN GREAT DEMON LORDS" ( ) and "THE SEVEN DEADLY SINS" ( ), and on the front, written in the following format:
SPECIAL MOVE 1
SPECIAL MOVE 2
SPECIAL MOVE 3