Requirements: must have completed the quest …is a famous Knight of the Round Table! and you will need the whois ...has entrance rights to the misty isle of Avalon.
Go to 'The Round Table' in Camelot, ASK ARTHUR GRAIL and he will tell you why the grail is so important to him.
#####Percival of Cymru
Your first step is to find Percival (He is not huntable), but he is at 'The Edge of the Exmoor' which is north, north, and west from Bors.
ASK PERCIVAL GRAIL
#####Seeker of the Grail
Next you must defeat Mordred and find out what happened to Joseph of Arimathea in that order.
Mordred (you need at least one other person to complete this step)
Go to 'On a Jagged Coast' which is south, two west, south, two west from Bors.
ASK FERRYMAN PASSAGE and you will be transported to Mordred's island.
Now you should shoot/throw along the path clearing knights, there are two bigger knights along the way which are optional.
Once you have cleared the knights, your group splits up one person goes north and the other south until each arrive at a lever, now you must time it so that you both pull the lever at the same time to open the way forward. The next rooms will contain more knights so be very careful since you will need to make it through potentially solo to meet back up with the other person.
Once you meet back up you can kill Mordred (get the tear from his corpse if you intend to do the Excalibur quest).
Joseph of Arimathea
Go to 'An Audience with King Avallach' in Avalon and ASK KING JOSEPH.
Joseph will then come out to speak with you, ASK JOSEPH GRAIL.
He tells you of the heir of the maimed king.
Return to Percival at 'The Edge of the Exmoor' and ASK PERCIVAL GRAIL.
#####Guardians of the Grail
Go to 'Sir Galahad's Chambers' in Camelot, ASK GALAHAD PELLEAS, he then tells you of the story of the lineage of his family and to meet him at the perilous rock near Exmoor.
You need to get to 'A Perilous Rock' have two ways to get to this room, either through the maze of Exmoor or head to 'The Shores of the Severn Sea' and ASK FERRYMAN PASSAGE then move west to Galahad and 'A Perilous Rock'.
ASK GALAHAD LINEAGE, he then tells you to go to the strange castle (note: the room you want is 'The Castle of the Fisher King') to meet the Fisher King.
From 'The Edge of the Exmoor' at Percival the castle is ne2ns2e (Possible randomized map? For me, it is 2NSEN2W)
ASK KING GRAIL, he tells you about how he came to be the guardian of the cup, he then gives you a cup and tells you to drink it.
DRINK CUP and you will be declared the new guardian of the grail and you can head west to leave.
#####Keeper of the Grail
From there You have one of three choices of who you can give the grail to for the final item.
You can give it to Sir Galahad, Sir Percival or King Arthur. They give three different items and the item is immediately bonded to the character you complete the quest with.
Sir Galahad - Galahad's warhelm
Sir Percival - Platinum Bracer
King Arthur - the mark of the Pendragon