Go back and talk to the gypsy in Varrock she will tell you.
A quest walkthrough for Demon Slayer can be found here: www.runescape.wikia.com/wiki/Demon Slayer
look on runehq
If this is part of the Demon Slayer quest, then the link below should direct you to your answer.
You have to do the demon slayer quest and near the end a person gives it to you to defeat the demon with it for silverlight. to get the blurite sword you have to do the knights sword. And you have to defeat the demon with the silverlight...
By doing Demon slayer quest
A quest walkthrough for Demon Slayer can be found here: www.runescape.wikia.com/wiki/Demon Slayer
After you have completed the 'demon slayer' quest you get it as a reward. >.<
look on runehq
If this is part of the Demon Slayer quest, then the link below should direct you to your answer.
You have to do the demon slayer quest and near the end a person gives it to you to defeat the demon with it for silverlight. to get the blurite sword you have to do the knights sword. And you have to defeat the demon with the silverlight...
you get ,you wont believe it, but you get a juice box
By doing Demon slayer quest
south east of varock were all the witches are
Finish the quest "Demon Slayer
You need 25 bones.
bucket of water
The Incantation during the quest 'Demon Slayer' is random everytime, and it given by the fortune teller, in the tent found in Varrock Square. If you forget the Incantation go see her again and write it down or remember it.