This article, Diamond Barricade, was created by A-ha.

Diamond Barricade is an earth spell that requires 87 Magic and 70 Slayer to cast. It may only be cast if a diamond staff is equipped.

Diamond Barricade and its lower-level variant Diamond Rain are the only magical combat spells that can damage metallic experiments, along with the diamond longsword and diamond twinhammers being the only melee weapons that can damage them.