Dragon Slayer

Walkthrough
Talk to the Guildmaster in the Champions' Guild. Ask him can I have a quest?, and he will tell you to talk to Oziach, who is located west of Edgeville and is very close to the wilderness. Oziach says that to be able to buy a rune platebody from him, you have to kill the dragon, Elvarg, located on Crandor Isle. You will need to obtain three pieces of the map to get to the island. Make sure you ask him where the keys are and where to get an anti-dragon shield.

Obtaining the Map Pieces
These map pieces may be obtained in any order - you do not have to go from top to bottom. When you have all three, use any piece on any other piece to form the complete Crandor map.

First Map Piece
The first piece is found in Melzar's Maze. If you need help navigating, start with the first floor of Melzar's Maze. It is not necessary, but you can have a friend help you with Melzar's Maze.,

Second Map Piece
To obtain this piece, you'll need an unfired bowl, created in the Crafting skill, a Wizard's Mind Bomb, which can be bought in Falador for 3 coins, a lobster pot, which can be bought in Port Sarim, and a piece of silk, which can be bought in Al Kharid, and also in Varrock in Thessalia's. When you have all these items, talk to the Oracle, who is located on Ice Mountain. Then, when the Oracle is done talking, go into the Dwarven Mine with all those items. Look for a door in the northeast part of the mines. It is just north of the area with the scorpions. When you've found it, use all the items on the door. They will disappear after usage. Open the chest and search for the second map piece.

Third Map Piece
The third and final piece is obtained by doing one of two things. Both involve Wormbrain in Port Sarim jail.
 * You can kill him using range or magic and use Telekinetic Grab to get the piece.
 * Additionally, you can pay 10,000 coins for it.

With all three map pieces, simply use two together and they will all combine into the treasure map.

Note: in RuneScape Classic, Telekinetic Grab was the only way to complete the quest after some quest items were made nontradeable.

Obtaining a Boat
You will need 6 steel bars, a hammer and 3 planks. Smith 6 steel bars into 90 steel nails, or you can buy them from the Guild Master in the Champions' Guild, General Store or other players. Next, get a hammer and 2,000 coins. Go to Port Sarim and look for Klarense, a sailor. He is located in the southern docks. He will sell you his boat named Lady Lumbridge for 2,000 coins. Pay him the 2,000 coins and the boat is now yours. Go on the ship and go inside it. Repair the hole in the ship by using the planks with the hole. Do this three times and the hole will be repaired. Next, go to Draynor Village and find Ned, the person who makes ropes for you. Bring your map. Ask him to be the captain and help sail you to Crandor. He will agree and tell you to meet him on your ship.

The Fight
Now it is time to prepare. Bring three good items (unless you want a friend to stand outside to telegrab your items if you die): your anti-dragon/dragonfire shield, a weapon and armour. The rest of your inventory should be filled with food; lobsters or swordfish would do. Swordfish (14hp) would be preferable even though they are more expensive than lobsters (12hp) and hard to obtain. If you are rich or have a cooking level of 45 or higher, make Meat pizza or Anchovy pizzas as they can heal more than Swordfish. Although,you need 2 bites to finish a pizza. A meat pizza heals 8 HP per bite (16hp in 2 bites)while an anchovy pizza heals 9 per bite (18 hp in 2 bites).

Go to your ship and sail to Crandor Isle. You shall experience a short cutscene, where Elvarg flies over your ship in circles and sets it on fire! Cabin Boy Jenkins starts to panic, gets hit by a fireball and dies. After crashing on the island, make your way through the island to the top, avoiding the monsters there. You'll see stairs behind some lesser demons. Run past them and go down the stairs. You will see a short cutscene of Elvarg coming towards you. You'll be in a cave surrounded by skeletons. Keep walking and you'll see Elvarg behind a few short spikes protruding from the ground. Climb over them, making sure that your anti-dragonfire shield is equipped. Fight Elvarg and defeat her.

It is also important to use stab or crush attacks, such as daggers or warhammers since Elvarg has slash resistance so slash attacks are much more likely to miss. But make sure you can still equip your anti-dragonfire shield or the fight will be over before you can get her to half life or even at least hitting her 3 times regardless of high healing food.

Battle Strategies
As mentioned always use stab or crush attacks so an adamant sword/rune sword is recommended. If you are a member then you should also use a adamant spear/rune spear with weapon poison so the battle will go much easier.

Range or magic are NOT recommend when fighting Elvarg since there are no safe spots to range or mage where the dragon cannot reach to you. If you use range on the dragon, make sure you are using a crossbow since it is one-handed, unlike a bow which is two-handed. With the crossbow, you are still able to equip the anti-dragon/dragonfire shield necessary for the quest.

If you are using mage attacks it is recommended that you use the fire bolt spell or higher. Using spells below bolt level is NOT recommended. As always, equip the anti-dragonfire shield when fighting. Also bring teleporting runes just in case you are about to die. Spells that weaken Elvarg can help, but are not needed. It is recommended that you bring at least 50 casts if you are using the fire bolt spell. For lower level spells bring more runes to cast. Remember to keep away from Elvarg's claw, it will do incredible damage without sufficient metal armour.

Although it is up to you to determine what fighting style best suits you, it is recommended that you fight from far away with range or magic, instead of close up, as Elvarg's fireball spells are believed to hit higher than her melee attacks, but melee attacks are quicker.

Finishing up
You are not finished once you kill Elvarg. The quest has been extended, and Elvarg's head must be taken back to Oziach in order to complete the quest.

Getting Out
Run out of Elvarg's room and continue going south, avoiding skeletons and lesser demons. There is a "secret" wall in the way, which you can go through and end up in the Karamja volcano area. From then on, you can go back through the wall to train at Crandor Isle. Some players also exit first so they have an "escape hatch" ready if the fight should go badly.

Reward

 * 2 Quest Points.
 * The ability to wear a Rune platebody and Green dragonhide body.
 * 18,650 Strength experience.
 * 18,650 Defence experience
 * Access to Crandor Isle.

Note
If a player tries to talk to Ned after he/she has sailed to Crandor (doesn't require completion of the quest) and asks the question "How did you get back from Crandor?", Ned will simply explain "I got towed back by a passing friendly whale."

Trivia

 * In RuneScape Classic, Telekinetic Grab was the only way to complete the quest after some quest items were made nontradeable, that made the needed mage lvl become 34.
 * Before the Crandor isle update, there was no cut-scenes of Elvarg at all. The dragon never set fire to the ship, but rather, the captain who sails on it says he made a "Wrong turn".  Strangely enough, there is no mention of the cabin boy after you sail out to Crandor.  Also, as soon as you kill Elvarg the dragon, she simply dies, you do not behead the dragon, and the quest was complete after the dragon was slain.