How to Complete the Demon Slayer Quest in RuneScape

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The award to the Demon Slayer Quest is a Silverlight sword, useful when battling demons.

Steps

She is next to the clothing store. She will tell you to pay her 1gp to read your future. Give her the money and ask her to tell you about someone who defeated a demon. Ask her about the Magical Incantation, and write it down on a piece of paper.
He is on the left side when you enter the castle. He says that he has the Silverlight, but he needs 3 keys to open the box.

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Argue with him and he finally lets you have the 1st key.
You will see the key by clicking "Search Drain". Use a bucket of water to wash it down to the varrock sewer.
If you go through the passage on the left, you will find the rusty second key near a small river and some zombies on the other side.
He needs 25 bones to open the box containing the third key.
(Don't forget your Silverlight Sword)

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Look very carefully for the rusty key.

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When fighting the demon, try waiting outside until the demon is close to you and the wizards are far from you. The wizards won't fight you when you are fighting the demon.

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Do not switch to any other weapons. Silverlight is the best for fighting demons.

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The incantation is different for everybody.

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The wizards are strong for low levels - Level 7 and Level 20.

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