From Wikimon
King Device
Activation Timing: Battle Phase
◎You may only place one of this card in your slots; cannot receive the effects of 'Items being invalidated' or 'cannot receive the effects of Option cards'.
◎You may only have up to 6 cards with the word 'Device' in their name in your deck.
Category: Device
Effects: ◎Add 800 to your attack power.
◎When your opponent has Option cards in their slots with equal or higher capacity than this card (regardless of type of Option card), you may invalidate one of those cards before it takes effect, and stack it onto the point gauge.
◎When you have a Queen Device in your slot, immediately reduce the opponent's points by 10. When you have a Rook Device in your slot, during battle, reduce the opponent's attack power by 400.
◎This card can only be used when your Digimon is Ultimate level with a basic A attack power of 560 and below.
◎Stack this card onto your point gauge immediately after use.
発動タイミング: バトルフェイズ
カテゴリー デヴァイス
[効果]: ◎自分の攻撃力を+800する

Card Errata (As of Ver. 1.6):
Corrected - The Category 'Device' is added. (カテゴリー欄に「デヴァイス」を追加。)