Talk to Father Reen south of Al Kharid bank.
Talk to Father Badden in Uzer, east of Shantay Pass.
Pick and grind a black mushroom and dye Silverlight black. (You can find some beside the staircase)
Go down the stairs and talk to Evil Dave wearing your 3 black items and your dyed Silverlight.
Talk to Denath.
Talk to Jennifer to get a demonic sigil mould.
Talk to Matthew.
Go to any furnace and smelt a demonic sigil. Your black outfit can be discarded at this point and replaced with combat gear.
Talk to the clay golem outside about last night.
Look-in the nearby Broken kilns for a book until you have found the Demonic tome.
Read the Demonic tome, and talk to Matthew back in the lair.
Go north to talk to Denath and write down the incantation he tells you.
Complete the circle and click the sigil to chant the incantation. Don't forget the incantation as you will need it later on in quest again.
Be sure to take the sigil from the floor, or you will have to make a new one at a furnace.
Exit the portal and take Tanya's sigil.
Tell Evil Dave to return to the lair - you should have 4 sigils now.
Rallying the troops
The final fight
Talk to Matthew to start the incantation.
Chant Demonic Sigil and say the incantation backwards.
Kill the demon with Silverlight (dyed).
Unequip Darklight to choose your reward.
1 quest point
10,000 experience in any combat skill, except Prayer and Summoning
Demonic sigil (can be used to chant any number of times even after the quest)
Demonic tome (updated in your bookcases)
Silverlight turns into Darklight: It is even more powerful against demons. If a player loses Darklight, it can be retrieved by talking to Grüfeld Bach at Varrock's north church. You must have him replace Silverlight for you first.
You can loot the demon throne at the north end of the room to obtain 2 emeralds, 2 sapphires, and 2 rubies
2 Treasure Hunter keys and 2 Hearts of Ice
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