Scáthach's Gáe Bolg is a weapon featured in the Fate/Grand Order anime and game, associated with the character Scáthach, a Lancer-class Servant. Scáthach, also known as the "Shadowy One," is a legendary warrior queen from Irish mythology who resides in the Land of Shadows, a realm separate from the world of humans.
In the Fate series, Gáe Bolg is a powerful spear with a distinctive ability known as "Barbed Spear that Pierces with Death." The spear's most famous attribute is its "thrown spear" technique, which is associated with Scáthach's Noble Phantasm, "Gáe Bolg Alternative: Soaring Spear of Piercing Death." This technique allows her to throw Gáe Bolg with pinpoint accuracy, ensuring that it will always hit its target and inflict a mortal wound.
Gáe Bolg's unique ability is derived from its mythological origins. In Irish mythology, Gáe Bolg was a legendary weapon associated with the hero Cú Chulainn. Its name translates to "spear of mortal pain" or "belly spear," as it was said to cause fatal injuries that were difficult to heal. The spear was known for its ability to inflict wounds that could not be treated normally, making it a fearsome weapon on the battlefield.
In the Fate/Grand Order storyline, Scáthach wields Gáe Bolg with exceptional skill and power, showcasing her prowess as a warrior and the deadly nature of the weapon itself.