You simply right-click them and select (Attack Dark Wizard Level-7) or (Attack Dark Wizard Level-21) Just like a normal monster. If you haven't gotten Silverlight yet do not attempt to kill the Demon.
There is only 1 Demon that you can taunt in Runescape, and that is the Demon behind bars at the Wizards Tower, located at Draynor Village - Top Floor.
Rocks containing Tin can be found south east of Varrock or directly east of the wizards circle where you fight the demon in the "Demon Slayer" quest.
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 need at least a mithril armour to prevent dark wizards to attack you. With silverlight , you can kill it by 1 shot. (silverlight is weakness to any demon , including the demon you have to kill in mezler maze when you do dragon slayer.)
Wizards of the Demon Sword - 1991 was released on: USA: June 1991
Wizards of the Demon Sword - 1991 is rated/received certificates of: Australia:M UK:15 USA:R
If you are tlaking about the glitch by the dark wizards by varrok, you need to start the demon slayer quest until u get silverlight, then stop. Then when u walk into the dark wizard circle you will only see delrith (the demon) and will be invisible to everyone else
A quest walkthrough for Demon Slayer can be found here: www.runescape.wikia.com/wiki/Demon Slayer
Taunt the demon at the top of the Wizards' Tower(By choosing the option from the cage)
Lesser demon: 85 Greater demon: 97 Revenant demon: 150-250 Black demon: 167 Abyssal demon: 87
If this is part of the Demon Slayer quest, then the link below should direct you to your answer.
sell it to xena