what's the best way to keep your characters from gettin' brainwhammied by lich's and mind flayers? is there an amulet, a ring or helmet or a really good protection spell?

I read somewhere that in twisted rune, there is a greenstone amulet.
This prtects u from mind control, intelligance drain etc.
Also- in the harper hold, there is a helmet of charm protection- this puts a MInd Sheild on whoever wears it.
Also- for liches...
You only realy need to defeat 1...
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The one in the backroom of the crooked crane (city gates). In the chest is the lngsword daystar, its eqiped ability sunray destriys undead easily, also the sword itself does alot of damage...
+2,+2 vs Evil Creatures, Double Damage vs, Undead.
Sunray is also a preist spell in the higher levels achievable in SOA... 6 i think, but i tmught be a level 7...

Chaotic Command, level 5 Priest Spell.

Lilarcor, the equilizer works too.

Just posted an extensive reply about mindflayers in this thread, so check there.
For liches, you can also use the upgraded Mace of Disruption +2, which, if you're in luck, will destroy them in one blow.

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You can find the Mace in the Pool of Blood in Bodhi's Lair in the Temple District. To upgrade it, go to Cromwell with the Mace and the Illithium Ore you obtain in the Sir Sarles quest.