Silence Attack (サイレスアタック, Sairesu Atakku?, lit. Silece Attack), also known as Silencing Strike, is a recurring ability in the series. It is a physical attack that attempts to inflict Silence to usually just a single target.
サイレス (Sairesu?, lit. Silece) is the Japanese name of the, Silence spell. The name derives from the transliteration of the word "silence" into Japanese (サイレンス, sairensu?) but with the ン (n?) removed to follow the four-character Japanese naming scheme for spells.