[PantherPrincess]

But silence already does the job? They have to break the invocation to either use screamer or use silent prayer? And if they build sanctity well then yeah I guess that's a wall. On another note it takes some time to set it up. And these are points you're investing into Words of Power. I think the best solution is what Kunai said but rather character level it could take into account the difference in your Will and your opponents and add that.