One question.
Fighter A attacksb BBEG a has true seeing.
BBEG has displacment spell and mirror images and spell resistance.
Must A beat the SR of BBEG so that true seeing does work on him?
If so and A doesnt beat the SR woud then the mirror images and the displacement spell work against A?
Spell resistance only works when you're the target of the spell. The target of True Seeing in this case is the Fighter. The target of Mirror Image is the BBEG.