The Knight's Sword/Quick guide

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Rewards

 * Quest point
 * Smithing experience
 * A blurite sword (if you got Thurgo to make you an extra one)
 * The ability to smelt blurite ore into blurite bars

Walkthrough

 * Talk to the Squire in the White Knights' Castle. (chat options: 1, 2, 1, 1)
 * Talk to Reldo in the library of Varrock Palace. (option 4)
 * Talk to Thurgo south of Port Sarim - and give him a redberry pie - Talk to him again. (2, 2, 2)
 * Walk / Teleport to Falaodor and talk to the Squire.
 * Go up the ladder in the Eastern part of the Castle, then use the stairs in the central room of the castle to end up in Sir Vyvin's Room on the, and search the cupboard in his bedroom, to find a Portrait. He must not be looking at you or in the room.
 * Talk to Thurgo, bring your iron bars so you don't have to go to the bank later.
 * Go to the Asgarnian Ice Dungeon using the trapdoor to the East.
 * Once inside, follow the path West, North, and then East. Keep along the Southern wall in the icy area and mine a blurite ore.
 * Talk to Thurgo again - Bring your iron bars and blurite ore - Talk to him again and he'll make the blurite sword. (2, 2)
 * Bring the sword to the Squire.