Mirrorball is a Legendary Source for the Wizard in Diablo III. It requires character level 31 to drop.
Mirrorball is known for effectively doubling (or tripling) the effectiveness of Magic Missile. The additional missiles fly in the same direction, with slightly different angle, effectively in the same way as Split rune of the said skill. With Split rune, only adds 1-2 more missiles, to the total of 4-5 per cast.
Stats (Level 70)

Mirrorball
Legendary Source
Properties:
- +[340 - 370]–[380 - 450] Damage
- Critical Hit Chance Increased by 8.0 - 10.0%
- Magic Missile fires 1 - 2 extra missiles.
- +626 - 750 Intelligence
- +3 Random Magic Properties
"Summoned from beyond the veil of death, and disposed to send its victims back there, the malevolent intelligence within this silver sphere may only be controlled by someone with intense resolve. Once its power is harnessed, however, the ball acts as a loyal enforcer of its master's will." —Deckard Cain
Trivia
- The description appears to be a reference to the Tall Man's signature weapon, floating metal orbs, featured in the Phantasm movie series.
- Mirrorball is a common term for a disco ball.