Ormraxes said:
The 5th level spell Lower Resistance from the 2nd Edition Tome of Magic lowered the magic resistance of the target by 30% + 1%/level, IIRC. The target also had its magic resistance cut in half when trying to resist this spell, making it much more useful, especially against lone powerful opponents.
I decided that
lower resistance was actually underpowered for a 5th level spell in 3rd edition. I use the following version in my campaign:
Lower Resistance
Transmutation
Level: Brd 4, Sor/Wiz 4
Components: V,S
Casting Time: 1 standard action
Range: Short (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: 1 round/level (see text)
Saving Throw: Will negates (see text)
Spell Resistance: No
This spell lowers the spell resistance of the target creature by 1d6 points +1 point per three caster levels (maximum +6) for the duration of the spell.
The spell is specifically designed to counter spell resistance, and is not affected by spell resistance itself (unlike most targeted transmutation spells, see p299
Dungeon Master’s Guide).
Lower resistance works against both natural spell resistance and that provided by spells or magic items. The spell has no effect on a creature’s immunities from a spell or spells (for example, a golem’s immunity to magic), and does not affect a creature’s saving throws against spells or spell-like abilities.
The target creature is entitled to a saving throw to avoid the spell’s effects. Further, an affected creature with natural spell resistance gets an additional saving throw every round, at the beginning of the caster’s turn. If it is successful it puts its spell resistance back up and the spell ends. Spell resistance from a spell or a magic item is lowered for the entire duration of lower resistance.
Cheers, Al'Kelhar