"Mekk-Knight", known as "Jack-Knights" (ジャックナイツ, Jakkunaitsu) in the OCG, is an archetype of LIGHTmonsters debuting in Extreme Force. The archetype is both related to and supported by the "World Legacy" archetype. All members of this archetype are Psychic monsters, except for the following:
All "Mekk-Knight" Main Deck monsters share the following effect:
"If 2 or more cards are in the same column, you can Special Summon this card (from your hand) to that column."
Thus the archetype relies on Special Summoning high level monsters while there are two or more cards in the same column to swarm the field and generate hand advantage. "Mekk-Knights" has a Kozmo Town-like recovery method in the form of "World Legacy Key". The Field Spell is very powerful against Extra Deck reliant Decks; but otherwise fares poorly against Deck (or Deck variants) with no Extra Deck monsters such as Kozmo, Monarch, BLS, Nekroz, or True Draco and is resource-intensive.