The Noob Slayer

Nargoth the Elder Seer's Vision
After talking to Nargoth the Elder Seer, he will teleport you to Gypsy Aris in Varrock. Talk to her, and select the option "Can you help me?" After talking for a bit more, a cut-scene will occur, in which Aris looks into her crystal ball. You see a familiar island. TUTORIAL ISLAND! Millions of noobs are overflowing the island! And it's your task to stop them! Now, grab your planks, nails, and hammer, and head over to either the experienced mine in Lumbridge Swamp, the Wizards' Tower, Mudskipper Point, the Shipyard on Karamja, or the Bedabin Camp in the Kharidian Desert.

Building the Bridge
Use a plank with the shoreline, and you will start to build a bridge to Tutorial Island. Doing this will grant you 14,000,000 experience in Construction, instantly boosting you to level 99. Now, cross the bridge until you see a toll booth. Select the "Pass Toll Booth" option. Nargoth the Elder Seer will teleport in and stop you. He will give you a Sword of Noob-slaying, a Noob-slaying Explosive, and some Noob-slaying Armour. Equip all the items, except the Noob-slaying Explosive, and pass the toll booth. The noob inside will stop you. Now select the "Destroy" option. The toll booth will instantly blow up upon your awesomeness glaring at it. Now proceed onto the island. Now, equip the Noob-slaying Explosive, and click any noob you want. You will throw the explosive, blowing up all but two squares of the island. On one square is (obviously) you. On the other is a portal. Click the portal.

The Super Noob
Re-equip the Sword of Noob-slaying at this time. After clicking on the portal, it will grow into a Super Noob, level 90. Despite its extremely high level for a noob, it only has 15 hp. If you equip the sword, you should hit a 14 on your first hit. The Super Noob will kneel down and beg you for mercy. In order to complete the quest, you must kill him, so select the option "OWN Super Noob." You will now own the Super Noob in a cutscene where you slice every part of his body off. The Super Noob drops noob bones and a portal seed. Now take the seed and plant it. Log out of RuneScape, and log back in 1 minute later. Now hop in the portal and you will teleport back to RuneScape!

Rewards

 * 1 QP
 * Access to the Super Noob Dungeon on Tutorial Island
 * Sword of Noob Slaying
 * Noob-slaying armour
 * The "[Name] the Noob Slayer" title