Decoder strips (Dimension of Disaster)

Decorder strips are used during Dimension of Disaster: Defender of Varrock to crack the code to the treasure room safe, and destroy the black prism. The decoder strips can be easily be obtained on the first floor of the New Varrock Palace in the room with the Armoured zombies by searching the crate of decoder strips.

These same decoder strips are later used in Dimension of Disaster: Curse of Arrav to crack the code to unlock the vault door to retrieve Arrav's heart.