Swords of Concealing Light (SD5-EN031) - Structure Deck: Warrior's Triumph 1st Edition

When you activate this card, change all monsters on your opponent''s side of the field to face-down Defense Position. As long as this card remains face-up on the field, monsters on your opponent''s side of the field cannot change their Battle Positions. Destroy this card during your 2nd Standby Phase after activation.