I think Extreme magic vulnerability and some arrows. and I mean by chance of hitting through the glamour for at least one point of damage. So basically with Van you can now take their glamour with arrows, just not kill them without help something like magma bolts works well tho.
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"Talk is cheap, but if it keeps your belly full and your grave empty it is worth more than gold." - Lords of Magic Manual.
"Luck is what others call skill when they have none." - Phelean Wolf
The nerf was that mirror image no longer affects missiles. But arrows still can break the glamor.
Helheim, which was the main nation brought up in complaints about glamour, was also weakened in a few other ways. Mostly capital only svart alfar, I think.