Blood of the Pale Moon (3.5e Epic Spell)

Summary::You creates a very livid, realistic, but highly morphic illusion that spans a massive area, in which you may determine who to try and affect. Targets caught within the illusion willingly regard it as a substitute reality, i.e., believe it to be real. The illusion contains audible, olfactory, tactile, taste- and thermal effects, and the visions and sensations incurred compel the interpreting mind to feel great pain or confusion. If a target fails a will save, it is exposed to a certain effect decided by a percentile.

This spell delivers its damage by placing interfering currents of powerful magic in the synapses of one’s brain. Any profound external impulse, such as pain, can sever the illusion’s hold over a target’s mind. Any external pain or damage incurred by a creature under the effect of this spell (i.e. not caused by the effects of the spell itself) entitles it to make another Will save to try and shake off the spell.