Slow will lower its ac by 1, among other things.
I'm not sure its what your looking for exactly but there's a bunch of spells that will lower dex or make them lose their dex bonus to their ac.
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Bestow Curse can reduce Dex by 6, which will reduce AC by 3.
Any spell or effect that makes a foe Blinded (-2 AC, loses Dex bonus to AC), Cowering (-2 AC, loses Dex bonus to AC), Entangled (-4 Dex = -2 AC), Exhausted (-6 Dex = -3 AC), Fatigued (-2 Dex = -1 AC), Flat-Footed (no Dex to AC), Grappled (-4 Dex = -2 AC), Helpless (+4 bonus to hit, Dex mod is reduced to -5), Paralyzed (Dex 0 = -5 AC), Pinned (-4 AC, loses Dex bonus to AC), Prone (-4 AC vs. melee attacks, +4 AC vs. ranged attacks) or Stunned (-2 AC, loses Dex bonus to AC) can help, such as grease or color spray or blindness or various summon monster spells (constrictor snakes and giant spiders and wolves can grapple, entangle or render foes prone, and centipedes can damage Dex with their poison, although few foes will fail that save DC...).
Mundane options, like a tanglefoot bag, net, whip, etc. can also help.
Making an ally Invisible (+2 attack rolls, ignores Dex bonus of foe) or Sundering armor worn by the monster (half AC bonus, round down) can also help.
OR you could go with Buffs to add to your peeps Attack roll which equals pretty much the same effect?.
OR you could go with Buffs to add to your peeps Attack roll which equals pretty much the same effect?.
Or do both? My witch does both (Evil Eye for enemies and Fortune and whatnot for allies)
Is there a spell that helps decrease a monsters armor class? If there is, those it affect mindless creautures?
3.5 is compatible with PF so, you couild cast Curse of impending blades (lowers AC by 2), can't be dispelled as it is a curse but does have a duration (I think 1 min/lv).