If I remember correctly, they left that decision somewhat up to the DM, unless otherwise specified. I know in the games I run, I typically allow weak illusions and blinding to work on many types of undead, the only exception being skeletons. (Phantasmal force would work on them, but not blinding). In fact, I think I remember both the pros and cons being listed for each side of that coin in one of the source books, though I fail to remember which one.
Also, crits should always work, forever. Unless your playing Baldurs Gate and your wearing a helmet. Because helmets need a purpose?
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Also, crits should always work, forever. Unless your playing Baldurs Gate and your wearing a helmet. Because helmets need a purpose?