Black Knights Fortress

Official Description [From Runescape.com]:
The Black Knights are up to no good. You are hired by the White Knights to spy on them and uncover their evil scheme.

Items Needed:
Cabbage*, Iron chain Mail, Bronze Medium Helmet

*The cabbage cannot come from draynor manor - anywhere else is fine

Skills/Quests Needed:
12 Quest Points

Start Location:
Falidor Castle

Combat:
Black Knight(s) - [Level 33] (Defend yourself for a short time)



Gathering the Materials
After accepting the quest, you should gather all your materials. You will need the iron chain mail first - probably from Wayne's Chains in Falidor, south of the castle but north of the gate (turn west at the guard post). Next head to Draynor Manor where you can pick up the bronze medium helmet at the Eastern Door. Finally head to the monestary and pick several cabbages - you may accidentally eat one so its best to have extras.

Heading to the Fortress
The fortress is located in the wilderness. Head North of Ice Mountain, to the main door - which you will find is locked. Put on the helmet and chain and head around to the side guards entrance.

Navigating The Castle & The Plot
After entering, head through the fake wall, up 2 sets of ladders, down the other ladder, through two doors to the east, and then up and back down the next 2 ladders. Go out to the balcony and down the ladder, then quickly down the secret passageway and listen at the ventilation grill.

Foiling the Plot
After hearing about the plot, go back to the door you entered through, then past the door to the east. Move up onto the ladder to the outer wall. Right click the cabbage and use it on the hole in the floor, then teleport or walk back to Sir Amik Varze for your reward.

Reward:
2500 GP, 3 Quest Points

Random Tip:
The normal spellbook is for fighting monsters, while the ancient spellbook is for pvp, and the lunar spellbook is skill-based. Each is interchangable, however more effective if used appropriately.
Scam Alert!
A less common scam nowadays is the itme duplication scam. Items cannot be duplicated, no matter who tells you what. It is not possible.