Knight's Sword

Start
You can begin by finding the Square in the courtyard of the White Knight's Castle in Falador and asking him how he is fairing. He tells you he has lost Sir Vyvin's sword and it was a special one smelted by imcando dwarves.

You offer you services to help make another and the Square suggest you go walk to Reldo in Varrock palace about making another.

The Search for Dwarves
Make your way to Reldo who is found on the ground floor of the palace in the library and ask him about the imcando dwarves. He reveals that this entire race of dwarves was almost wipped out by Barbarians, so only a few small number exisit, however they can still be found. He suggests you travel to mud skipper point to find them and bring a red berry pie as they appear to like them and this would be useful if you want to ask of their services.

Thurgo
Once you have your red berry pie, which can either be made with 10 cooking or bought from another player, travel to mud skipper point located south of Rimmington. An imcando dwarf is located in a small hut indicated by an anvil sign on the mini-map. His name is Thurgo and he will glady make your sword in exchange for the pie, however he needs a picture to make an exact copy.

Head back tot he square and ask for a photo and he will inform you that he does not have one, but one can be found in a cupboard in Sir Vyvin's room.

Climb the east staircase and travel up the closest west stair case to the thrid floor and search various cupboards in the rooms untill you find the photo. Then return to the Dwarf and give him the photo and then he says he will need you to mine some ore for him to make it. 1 Blurite ore and two iron bars.

The sword
You can mine the iron ores in any near by mine and smelt them into iron bars. But to seek the Blurite ore it can only be found in more location, which is in an area underground full of level 53 Ice warriors and level 57 Ice giants.

With some food and armour head east of the hut until you find a place to travel down and you will find yourself in a cavern, travel down passed all the monsters until you come to an open cavern of ice, the Blurite rocks are scattered in various locations round this spot, try mine one which avoiding getting attacked by the monster around and then once you have mined the ore return to the surface.

Return to Thurgo with the materials and he will smith you the sword, quickly return to the square with the completed sword and claim your reward.