would silence spell work on an undead caster ?

Dremor

not sure if baldur's gate series has undead casters... but in any case would cleric silence spell shut down their spellcasting in case it sticks ?

Fardragon

Silence should work on undead spellcasters the same as it works on living. I think Liches have high magic resistance though.

DJKajuru

Liches are immune to spells of 5th level or lower. It should work on skeleton mages, mummies and vampires, though.

Lord_Tansheron

Liches are not only immune to certain spell levels, they also have a save vs. spell of 1, meaning they will make any saving through automatically unless it comes with a penalty.

However spells like e.g. Power Word, Silence (6th level, no save) should work. I'm not sure whether some liches don't have innate vocalize or something, though; my game is too heavily modded to say for sure.

semiticgoddess

Liches have no magic resistance; just the spell level immunities DJKajuru mentioned. Level 6 spells and higher will hit them just fine. Death Fog and Holy Word are both excellent options against them.

DJKajuru

Silence is VERY useful against greater mummies, since it prevents them from casting Symbol Pain and other nasty spells.