Holy Word Woes

[Mark]

So, I am now sick of Holy Word. I want to put evil creatures in front of my players, but, with high levels PCs and two players able to cast Holy Word, nothing is alive after one round. Without banning the spell, what have others done to make it work in the game but not have it over power the whole game?

A high level, evil NPC would keep himself aware of the tactics of potential opposition and guard against those tactics used most often.