Gigasword is an infrequently appearing skill in the Dragon Quest series, debuting in IV. Similar to Gigaslash and Gigagash, it is an electrically charged sword strike, though it targets only one foe instead of a group.
In the remakes of IV, the hero/heroine will learn the skill at level 50, dealing 250~300 zap type damage for 15 MP.
Note: though Gigasword is listed under the Hero/Heroine's spell list, it is not affected by Bounce.
In the remakes of V, the Conkuistador enemy will attempt to slay a character with the skill, but it will always fail and fry the faerie.