Remember the incantation Wally chants in the cutscene as it varies from player to player. If you forget it speak to Aris again and ask her about what the magical incantation was.
Speak to Sir Prysin on the ground floor[UK]1st floor[US] at the south-west corner of Varrock palace (3•1•2•2)…
3
Aris said I should come and talk to you.
1
I need to find Silverlight.
2
He's back and unfortunately I've got to deal with him.
2
And why is this a problem?
First key
Go to north-west corner of the palace and go up two flights of stairs.
Speak to Captain Rovin in the north-west tower on the 2nd floor[UK]3rd floor[US] about the demon. (3•1•2•2•3•1)…
3
Yes I know, but this is important.
1
There's a demon who wants to invade this city.
2
Yes, very.
2
It's not them who are going to fight the demon, it's me.
3
Sir Prysin said you would give me the key.
1
Why did he give you one of the keys then?
Second key
Go to the kitchen to the north-east, on the ground floor[UK]1st floor[US].
If you don't have a bucket of water, head up the staircase in the kitchen and grab one from the room to the east. Head back down to the kitchen and fill the bucket from the sink.
Use a bucket of water on the drain outside of the eastern kitchen wall.
Climb down the manhole east of the palace, just outside the wall near the tree patch.
Take the north-west path down to the end and take the rusty Silverlight key from the floor. (It does not appear on the minimap)
Third key
Take 25 un-noted bones from your bank.
Ultimate Ironmen: You can deliver the bones a few at a time. You do not have to deliver all 25 at once.
He will ask for 25 bones (noted will not work); bring him these and he will give you his key.
Delrith
Return to Sir Prysin (south-west room of Varrock Castle) and give him the keys.
Wield Silverlight and go to the Dark wizards by Varrock's south entrance. A cutscene will occur.
Defeat Delrith; right-click Delrith and banish him with the incantation seen earlier. The incantation varies from player to player; Aris will remind players of the incantation if forgotten.
Ultimate Ironmen: You can deliver the bones a few at a time. You do not have to deliver all 25 at once.
Quest points