M.O.D.S (Magical Offensive/Defensive Subroutines), or simply "Mods", are passives on most equipment that can be moved to the same Slot Type, eg. Helmet to Helmet, Weapon to any Weapon, but not Helmet to Boots. Mods can be found throughout the game, with more available in higher difficulties.
== Quality ==
Mods comes in a ten-tiered quality system, also known as the "Qualibean".
Differences between the first nine are mainly marginal. However, the difference from the Ninth to Tenth Tier quality is quite significant as that will allow the mod to reach the maximum stat value when it reaches Chaos VIII stat level.
=Armor Mods=