Prismatic Eye

‘Prismatic Eye’ – With a popping sound, a moist, apple-sized eye with a rainbow-hued iris appears and sends a beam of colored light at the foe you designate.

(Spell Compendium, p. 161)  
Originally posted on D&D tools

Evocation

Level: Sorcerer, Wizard 7,
Components: V, S, AF,
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Effect: Magical eye
Duration: 1 round/level
Saving Throw: See text
Spell Resistance: Yes

You create a visible orb that can produce ray effects duplicating the beams of a prismatic spray spell. You can move the prismatic eye up to your speed as a move action, but it cannot go beyond the spell’s range.

Starting in the round the eye appears, you can command it to fire a ray (50-foot range) as a free action once per round. You must succeed on a ranged touch attack with a ray to strike a target, but each ray uses a +6 bonus on attack rolls instead of your ranged attack bonus.

A target struck by a ray suffers the effect of one beam of a prismatic spray spell (roll 1d8 to determine the effect, rerolling any result of 8), except that the save DC (if applicable) is 19. After a particular color of ray has been used, it is no longer available to the eye, and die rolls that indicate the same color are rerolled. Once all seven rays have been fired, the eye remains until the spell’s duration expires. You can still move it, but it can fire no more rays.

The eye is a Fine object with AC 18 (+8 size) and 9 hit points. It uses your save bonuses for saving throws.

Focus: A polished, rainbow-hued abalone shell.