Joseph's Holy Grail

Joseph's Holy Grail (ヨセフの聖杯) refers to the legendary sacred vessel in Christian mythology. According to the legend, it is the cup or plate used by Jesus at the Last Supper. Joseph of Arimathea is said to have receive the Grail from an apparition of Jesus and also uses it to catch the blood of Christ.

Index Arc
Index cites to Kamijou Touma the Grail, among other things such as the Spear of Longinus and The_ROOD as the limits on how magicians are capable creating substitutes for ceremonies using modern materials.