level 14 Wilderness, at the Dark Warriors Fortress

For this clue you will need to go level 14 wilderness (see below image).

Do not take any high valued item as it wilderness and could get PK or killed by monster
Bring alot of food as knights do hit high.
Bring teleports runes or  teleports tab to tele out once done.
When enderting the knight fortress use  protect from melee.
DO NOT OPEN TREASURE UNITL OUTSIDE OF WILDERNESS.

search the pile of crates in the south-west corner of the central courtyard.