In the world of Avalon Code, everything, living or non-living, is made up of "Codes". These codes define the personality of a person or a monster.

There are various codes scattered throughout the game. Some Codes gives additional damage to enemies, while some codes gives the weapon a new element. Some Codes are useless, until they are combined with the right Codes, then they become powerful and can heal various illnesses or remove negative Codes.