Rats, squirrels and other useless animals. If you are playing an evil character, you have to kill em. In bg1, they gave me a lot of xp.
But for real monsters, I like to kill golems.
And I hate mind flayers. I don't know why, but they always go for Valygar. In the mind flayer lair in the underdark, Valygar couldn't survive one fight without beeing braindrained.
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See the ravaging effects of smoke!