The Sorcerer in my game has this spell. And it is a pretty damn scary spell considering its very nearly a Save or Screwed situation. Between Hideous Laughter from the Sorcerer and Hold person from the Cleric, I was recently very concerned that they would manage to take down an NPC way too easily.
Happily, Wyrmlord Koth (from Red Hand of Doom) managed to make his saves, and then laid a pretty thorough beating on the players with careful applications of Lightning bolt, Blindness, and Scorching Ray.
There are plenty of ways around this. One suggestion is to simply make sure that Wis is not a complete Dump Stat for your warrior types. Another is to keep a friendly caster handy for your villains with a Dispel Magic handy. And yet another is to have archers use readied actions to pincushion hostile casters as they cast spells.
Ultimately though, using common archtypes with predictable weaknesses will get you destroyed. You will either have to start finding warrior types with some amount of Spell Resistance, or Warriors with strong Will Saves (Knight from PHB 2, Monks). Or just start using something else entirely. A Bebilith is CR 10, has a +9 Will Save, and its solid HP make up for the relatively weak AC.
Also, its a G*DD*MN Demon! By level 10, its not a bad idea to start throwing some of the truly out there monsters. Devils, Demons, Huge Elementals, they are CR appropriate. Their weak saves are not nearly as obvious (Quick, without looking what is the weak save of a Fire Elemental?). They are in the standard books (Unlike the Knight or some prestige classes). And they are quicker to prep than custom classed NPC's.
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