A diamond of protection is a protective shield that can defend against the Dead, as their body will burn up when they come into contact with it. However, it can only take so much damage, as The Destroyer annihalated three diamonds of protection in its first form after freedom.
The diamond of protection is cast by drawing four specific Charter marks- the Northmark, the Eastmark, the Westmark and the Southmark on the ground. When the diamond is complete, it appears as four golden, burning marks linked by golden lines. These are hot enough to melt snow.
It is possible that drawing using a Charter-spelled item, like the Abhorsen's sword, increases the strength of this spell.
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