In all the the grail legends the grail is an object with magical or spiritual qualities.

The grail often feeds those assembled in its presence and sustains the life of sick and dying kings. Different narratives disagree about what exactly the grail is. Depending on the version of the story, it is a serving dish, a stone or the cup that Christ drank from at the Last Supper or the dish Joseph of Arimathea uses to catch Christ's blood when he was on the Cross. Nevertheless, all versions describe the grail as a richly ornamented object.

"Attaining" or "achieving" the grail involves locating the grail castle where it is kept and performing required tasks in the presence of the grail. In some versions of the myth, the successful completion of task allows the knights to become the guardians of the grail themselves. In most versions, "achieving" the grail brings healing to a sick king and to his ailing land.