The Faithful Squire

After collecting all the other Crusader relics: The Boots, the Gauntlets, the Helmet, the Cuirass, the Shield, and the Mace, you will recieve a journal entry to return to the Priory of the Nine and talk to them about the remaining relics, the Greaves and the Sword of the Crusader. Once you enter the Priory, the Squire of Sir Roderic that you saw earlier in your quest is there. He tells a story of his master and how just like you, he visited all of the Wayshrines and recieved a vision, apparently a disturbing vision. After the vision his master kept mumbling about some old family and asked around for them. Finally they went to Pitfall Cave searching for the Greaves and the Sword of the Crusader. Once there, a unholy wraith attacked and killed Sir Roderic. Before he died, he told the squire to run, and that the sword was cursed and must be cleansed at the chapel in Chedinhyal. He also grabbed the greaves before he fled, and gives them to you. He hopes it helps.

He then asks you if he could join your knights, and if you say yes, he will get into the appropriate gear and join you on your quest to kill the wraith the murdered Sir Roderic and claim the Sword of the Crusader for your own.

Once you have all the armor of the Crusador, you get a holy aura buff that if you look at your magic effect screen is combined with Natures Grace from your boots to give you something called Umaril's boon, which later will allow you to face Umaril without dieing.

Once the squire meets up with you again you head out to the cave, where there are leveled undead inside, and a plethora of pathways, but just take the one to the left of the main area. Once you go down the tunnel, you should meet the waith of Lord Vasomething, who is the ghost of the evil Knight! After you kill him, you can take his sword, but it will curse you until you cleanse it at the chapel of Chedinhyal.

NOTE: I have no idea if something special happens if the squire lives, for he died while in the cave.

Once at the chapel, Umaril's servants are trashing the place again, so you have to dispose of them. Weird blood writing is on the floor around the altar, identical to the one you found in the Anvil Chapel. After you kill the yellow guys, cleanse the sword at the altar and complete the quest!