A true seeing effect allows the creature to automatically "see through illusions," and many powerful monsters possess a constant ability that grants the monster an effect like true seeing (e.g. some angels, demons, devils, inevitables, and even dragons).
Ideally, I'd like a way for a caster to create illusions that are not automatically seen through by an effect like true seeing. Alternatively, is there a convenient way—one that can be used in combat—for a caster to deactivate a foe's true seeing effect?
I am looking for spells, class features, feats, magic items, or anything else that will either make illusion spells immune to true seeing or suppress a true seeing effect.
(I am aware that the mind blank spell may affect a true seeing effect, but even if that works, an illusionist protected by the spell mind blank still creates silent image effects that are seen through automatically by a true seeing effect! The spell mind blank, for example, isn't any help if the illusionist wants her hallucinatory terrain spell to fool an army of balors!)