hey,

My party does not include a mage, and now I'm stuck at the Vale of Shadows, can someone please give me some hints how to kill the creatures that can only be harmed by magical weapons?

how about use magical weapons

Do you have any clerics or druids?

Yes, I have a cleric level 5

Cleric can most likely cast Magick stone and such, AND you most likely have found some magical weapons already. Magical weapon = Long sword +1 for example if you didn't know that.

Please note that those weapons which only improve thaco (the green shaded ones. I believe they are called "improved"?) are not considered magic.
If you dont have a magic weapon, you may consider buying from the smithy in Kuldahar or (spoiler ahead)
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Pick open the locked chest in the smithy's house to find one.

Turn undead?

they are called "high quality" or "finest"

You should have a slew of magical weaponry by this point. the Vale is practically bursting with +1 longswords, morningstars, and other equipment. Another tip: use a mage!

there are also some weapons that improve damage but lower THACO they're also greenish
i think they're called huge?

Huge for one hand weapons and massive for two hand if I remeber correctly. Warhammers are allway massive.

THX!!! I've already got two "longswords +1"