What you need: The Excalibur sword from the Merlin's Crystal quest. You must have done this quest before trying to complete the Holy Grail quest. If you need to re-obtain Excalibur, then you can get one by talking to the lady of the lake again. King Arthur: Will tell you to talk to Merlin. Merlin will tell you to talk to the High Priest of Entrana, and Sir Galahad who is living in a two story house on the outside west edge of McGrubor's Wood. Head to Entrana. Golden Feather: Go back to King Arthur and talk to him. He will give you the magic golden feather.