What does Holy Grail consist of?

it is a legend like in any other religion which like the one previous to me has said is a cup that Jesus Christ had sipped from which they say is one of the reasons why the crusaders fought the mohamaddans/islamists.As they thought the cup was the key to the universe and everything else in it as it has the imprint of Jesus.But according to some and by Dan Brown it is the sarcophagus/corpse/dead body of mary magdalene who is supposedly the wife of the famed son of God and whose lineage continues to this day and the Holy Church is trying to cover it up over the yrs while some or the other organizations of which the great guys leonardo,issac,einstein had been a part of have helped in ensuring the survival of the lineage which the church had tried to destroy.This is the secret quest of the crusaders for trying to capture Jerusulem the Holy city of Christianity,Judaism and Islam and which had an influence in Zoraster.