Errata is an edit to a card's game text after its printing, mainly to nerf or fix a card with too much power or a looping mechanism. (Errata is technically plural, but nobody ever says "erratum".) Decipher has issued errata for several cards, such as The Mirror of Galadriel (1R55), Sting of Shelob (18R35), and Howl of Harad (4U236). Decipher issued more errata in Rise of Saruman and Treachery & Deceit than any other sets, due to their hasty production process. The final errata issued occasionally did not either repair the card or instead made the card unplayable, for example Frenzy of Arrows (18U79).