Armor monster

Armor Monsters are a series of monsters exclusive to the Yu-Gi-Oh! second series anime. Armor Monsters can be recognized by the fact that, where on a normal Effect Monster it would read "Effect", Armor Monsters have "Armor".

Valon uses these cards during the Waking the Dragons story arc (Season 4). He often sacrifices parts of his armor to inflict damage to his opponent, or weaken his/her monsters.

Only one Armor Monster can attack per turn. If there are 2 or more Armor Monsters on a player's side of the field and one of them is declared as an attack target, that player can change the target to another Armor Monster he/she controls.

In the anime, they are displayed by equipping onto the duelist who plays them, rather than by becoming monsters. The duelist then physically attacks his opponent's monsters himself. Also, Psychic Armor Head, while active, gives the user certain information (card's effects, success probability, suggested offense etc.); though whether the success probability information is accurate information or not is unknown (this is similar to Duel Runner's helmet's).

A card like The Seal of Orichalcos is very critical to an Armor deck for 2 reasons; first, all Armor Monster's have 0 ATK (with the exception of Advanced Shield) and need an attack boost to 500 (Big Bang Blow is an example of cards that need this purpose); secondly and more importantly, Armor Monsters come in large numbers on the field (more than 5 monsters) and since The Seal can let you use 5 or more monsters, The Seal is critical. (on the online fan-made card game,duel monsters unlimited, armor monster were available, and the use of equip cards such as united we stand took the place of the seal in order to give suffcent attack power.)

However, Valon did manage to beat both Duke Devlin and Rebecca Hawkins in a 2-on-1 duel without using The Seal of Orichalcos though the use of the only armor tribute monster, double cloth armor.