The Grail Sword is a wondrous weapon whose broken blade, hidden inscription, or perilous fitting marks the difference between ordinary valor and spiritual worth. It belongs to the symbolic world surrounding the Grail, where weapons judge the hearts of those who touch them. In poetry, the sword may signify fractured destiny: a promise that can be made whole only by the rightful hand and a purified intention.

The Grail Sword is a sacred or wondrous weapon connected with the Grail quest, though its exact identity and story vary among romances. It may be broken, dangerous to handle, or reserved for a chosen knight, turning the act of drawing or repairing it into a test. It belongs with related Grail motifs such as the bleeding lance, the sword in the stone, divine election, and spiritual purity.