The Holy Grail was the cup of Christ. It was found by Jones.[1]
Behind the scenes[]
The Holy Grail appears as a possible answer to the Gargoyle's question "What is your quest?", mirroring the questions of the Bridgekeeper[2] on the Bridge of Death[3] in the film Monty Python and the Holy Grail.[4]
If this answer is chosen, the Gargoyle doesn't accept it, pointing out that Jones found it already; being a further reference to the Indiana Jones and the Last Crusade film.[5]