It slices a group of enemies with a blade of holy electricity. Despite its name suggesting a physical basis for its (very large) damage output, it in fact deals magical damage.
Making its debut, it is learned by advancing to Rank 6 of the Hero class.
Obtained by reaching Rank 7 of the Hero class, it acts the same as in VI. It can also be learned by reaching Rank 6 of the Champion class (Rank 7 in the 3DS remake) and by mastering the Ersatz Estark class.
The hero can learn Gigaslash as a sword-only technique after fully investing 100 skill points into either the "Sword" or "Courage" skills. If both skill are at maximum, he obtains Gigagash instead. The electrified slice targets one enemy group for 20 MP, and damage is calculated as lvl+180 +/- [20+lvl].
In Dragon Quest IX, the Gigaslash ability is obtained by allocating 88 skill points into the Sword Skill, and can only be used by a character who currently has a sword-class weapon equipped. Its damage output has a base of 160 and a maximum of 360, reached when the sum of the character's magical might and strength reach 300.
The Hero will learn Gigaslash for 25 points in his Swordmastery skill tree. It costs 16 MP to use, targets all enemies, and deals up to 210~250 lightning damage.
Gigaslash is described as "a legendary technique for cutting down a single enemy." It costs 16 MP to use and is learned from the Captain Crow, Cleric, Cluboon III, Diamagon III, and Uber Knight skillsets.
Gigaslash is a master stroke in Dragon Quest Swords.
Gigaslash appears as the Coup de Grâce of Aurora. She points her sword into the sky and summons lightning, then redirects it at a group of enemies.