Don't know, never found it of that much use. First plague or not, the mages always end up and minced meat hehe.. Secondly, it takes more time to get these bugs off then it takes to shoot up some protections. I aint much into spells so beats me whether the spell ignores this and that kind of protection. Fact's a fact - I once did try some Insect spell with Jaheira and these bugs got swiftly reflected back at her, so it was more trouble then use heheh.
Nah, as they say, there's nothing like a whack between the eyes to "fix" the spellcasters..
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