Dead Zone

Type: Undead
A Dead Zone is a sizable group of special type Zombies who posses the supernatural ability to act as a dampener on other Supernatural's powers. Adepts fighting a Dead Zone will feel a supernatural weight or force pushing back against them every time they try to use their powers. 
For it to work, there must be at least half a dozen of these special Zombies to make a Dead Zone. The larger groups of them create an even more powerful barrier. 
Dead Zones even work on Necromancy (except for Necromancy cast by someone controlling the Zombies of the Dead Zone).