After he's dead, he'll drop an Aqua Scale. Pick up this and
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equip it. Talk to it and he says he had been overcome fairly. He will dissapear and a chest will appear. Use the Thunder Key with the torso and hunt it. You'll be teleported out. You will still have the Aqua Scale, but now you have a Thunder Seed as well. He'll turn the seed to the Sword of Thunder.
Razorlike said to quit making quest thoughts, but it is not the end of the world if I create another, ok?
Archer's Flare
Requirements: 40 ranged, 31 magic.
Items: Yew shortbow, 1 log, any sort, a tinderbox, 100 steel arrows, ice gloves, and Varrock teleport runes.
Quests: Heroes Quest.
Start Point: Talk to the Armor Seller in the Ranging Guild.
1. Talk into the Armor Salesman in the Ranging Guild. He says its not actually a pursuit, but he would like you to go to the Archer Tower, located slightly west of Yanille. He will give you an invitation.
2. Head along the wall of Yanille, south of Ardounge, and
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along the western wall, you will discover a portalsite. Proceed and you'll be at the Archer Tower. Use your invitation with the clerk behind the desk and then go through the doorway.