Any info on anti-magic rooms?
In anti-magic rooms, there are varying chances for spells to fail. Most likely you just get a die roll against that rooms anti-magic number. If one dies in an anti-magic room, there is also the possibility of losing some or all of your magic items. There have been reports that sites like Blood Cairn (secret level 2) and Swamp Patrol (Lich’s Domain) have 100% anti-magic rooms. (ML) My recommendation is to avoid bringing mages with you if you know you will hit an anti-magic room. Their spells will be useless and their power level will still add to the monsters that are generated. Aim for bringing just one spellcaster on these adventures to difficult sites. I would not worry excessively about anti-magic rooms, though, as they are uncommon and generally located only in difficult sites. Consult the Adventuring sites section for opinions on what sites are considered difficult.