Critical multiplier

The critical multiplier indicates how many times damage is rolled in the case of a critical hit with a given weapon. (Damage is not multiplied, but rolled multiple times.) It is usually indicated after the threat range for a weapon, as in "19-20/x2" indicating that damage is rolled twice. When the threat range is 20, it is sometimes omitted, and just the critical multiplier is used to indicate the critical threat of a weapon (e.g. "x3").

The Increased Multiplier feat is the only way to change the critical multiplier of a weapon in Neverwinter Nights.