Anon the witch Domna came to him, and said that he had now learned all that she could teach him, and he must go and prove himself against greater powers than he had ever yet known. If he prevailed not in that battle, the ladies of the Castle of Weeds would become the prey of the witches, and greater power of evil would they have in the world than ever before. Then she gave him a horse and a full suit of black armour.
So Perceval took the horse, and armed himself and rode forth. And anon he came to a hermit's cell beside a ruined chapel, and he alighted and went into the chapel, and stripped himself, and laid all his armour, his lance, and his sword, before the high altar.
Prayerfully he gave his arms to the service of God, and devoted them one by one to do only knightly and pure deeds, to rescue the oppressed and the weak, to put down the proud, and to cherish the humble.
And as he ended praying, the armour stirred of itself, and though it had been black before, now did the darkness fade from it, and it all became a pure white. While he marvelled, a faint light glowed over hauberk, helm, shield, sword and lance, and there was an exceeding sweet savour wafted through the place. And ghostily, as in a silver mist, he saw above the altar the likeness of a spear, and beside it a dish or salver. And at the wondrous sight his breath stayed on his lips. Then slowly the vision faded from his sight.
He arrayed himself in his armour that was now of a dazzling white, and he rode forth and thought to go towards Camelot, where was the court of King Arthur. But he felt that some power drew him aside through the desolate ways of a hoar forest, where all the trees were ancient and big, and all bearded with long moss.
In a little while he saw a vast castle reared upon a rock in the midst of the forest. He rode up to it, and marvelled that it was all so quiet. Then he beat upon the door with the butt of his lance, and the door opened, and he entered into the wide dark hall. On the pallets under the wall he saw men lying as if dead. And in the high seat at the head of the hall sat a king, old and white, but richly clothed, and he seemed dead like all the rest. All were clad in garments of an ancient kind, as if they had lived and died a thousand years agone, yet had not rotted into dust. On the floor, about the wide heap of ashes where the fire had burned, the hounds still lay as if asleep, and on the posts the hawks sat stiff upon their perches.
Much did Perceval marvel at this strange sight, but most of all he marvelled to see where a shaft of light from a narrow window gleamed across the hall full upon a shield hung on the fire-pillar beside the high seat in which the king sat like one dead.
Perceval caused his horse to pick its way through the hall, and he approached the shield. And he saw that it was of shining white, but whiter than the whiteness of his own, and in the centre thereof was a heart. As he sat looking thereat, he marvelled to see that the heart seemed to stir as if it were alive, and began to throb and move as if it beat. Then the whiteness of the shield began to dazzle like to a light that mortal eyes could not bear.
He lifted his hand and took the shield by its strap from the peg on which it hung, and as he did so, a great sigh arose from within the hall, as if at one time many sleepers awoke. And looking round, he saw how all the men that had seemed dead were now on their knees, with bent heads and folded hands as if in prayer.
The king in the high seat stirred and sat upright, and looked at Perceval with a most sweet smile.