Talk to Father Reen south of Al Kharid bank.
Talk to Father Badden in Uzer.
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.
Search the nearby kilns for a book (don't forget to check the one north of the magic carpet, and the one to the east of the temple).
Read the book, and talk to Matthew.
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.
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
Go up the stairs, and you will see Father Badden and Father Reen walking around. Convince them to join the ritual.
Talk to the golem, he will refuse to help.
Go down the stairs and take the Strange implement from the floor in the north-west corner of the room.
Use the implement on the golem, then talk to him again. He'll now agree to help.
The final fight
Talk to Matthew to start the incantation, say it backwards.
Kill the demon with silverlight.
Equip darklight and 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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