Prismatic Spray not only blinds a creature, there are seven other additional effects possible.
|“|| Prismatic Spray|
When casting this spell, the wizard causes seven shimmering multicolored rays of light to flash from his hand, portraying all colors of the visible spectrum. Any creature with fewer than 8 Hit Dice struck by a ray is blinded for 5 rounds, regardless of any other effect. All creatures caught within the area of effect will be touched by 1 or 2 of the rays, each of which has a different power and purpose:
Red –– Inflicts 20 points of damage; Save vs. Spell for half.
Orange –– Inflicts 40 points of damage; Save vs. Spell for half.
Yellow –– Inflicts 80 points of damage; Save vs. Spell for half.
Green –– Save vs. Poison or die; survivors take 20 points of poison damage.
Blue –– Save vs. Petrification or be turned to stone.
Indigo –– Save vs. Wands or be feebleminded.
Violet –– Save vs. Spell or be disintegrated.