Black key black

Black key black is a key that is rewarded from the Shades of Mort'ton minigame. To obtain it, the player must kill an asyn shade and then burn its remains on a pyre. The key may be used to enter the Shade Catacombs and then open the correctly coloured chest. It will open a black-framed chest with a black lock. This type of key can only open doors up to black within the tomb.

Possible rewards
Possible loot from the chest includes:

Misc
Black key black