The phrase "original attack" refers to the first one, the initial action taken or strategy used in an offensive or aggressive situation. Full definition
Isayama's original Attack on Titan manga has 50 million copies in print worldwide, and the English - language edition has 2.5 million copies in print. (animenewsnetwork.com)
New planes — Along with the 2 original planes, there will be new planes available as DLC which bring all new original attacks. (gonintendo.com)
Further, using «they» is an acknowledgment that the insistence on «he» as the normative personal pronoun was what constituted the original attack on the language, made on the dubious grounds of strengthening some «natural order.» (religion-online.org)