You summon a flurry of stars from the sky on all targets within 30 yards of the caster, each doing X Arcane damage, and an additional Y Arcane damage to all nearby targets within 5 yards. Maximum 20 stars. Lasts 10 sec.
Starfall is a Druid ability from tier 11 of the Balance tree. It is a non-channeled Area of Effect spell that hits enemy targets within 30 yards (up to 36 yards with [Nature's Reach]) of the caster. Although it does not cause an especially high amount of damage, it is a 10 second buff that does not require player interference, which allows a druid to have it up while casting other spells and abilities. The buff itself cannot be dispelled or spell stolen.
In PvP, Starfall becomes a valuable, albeit dangerous ability; when used against large crowds it can deal massive damage, but also often results in focused attack on the druid.
This ability is not especially necessary for a BalanceDPSbuild, but provides helpful AoE utility.
Starfall can be used on a boss fight to deal additional damage without much if any deficit, as the GCD used to cast the spell will be made up for in the amount of damage it deals, provided you are in range of the boss or mobs for the duration.
If you do not have the Glyph of Focus, it is very important for you to know what mobs are around you and if they are within 30 yards of you (36 with [Nature's Reach]) before casting Starfall because it will hit every target in a 36 yard radius around you.
This move should be used very carefully in open world PvP, as the stars will damage EVERY target within 30 (or 36) yards of the caster, including otherwise unhostile mobs. Using this in a crowd of yellow mobs will very quickly make you wish this move wasn't even part of your arsenal.
Effecttive in boss fights, as every star that critically hits will trigger [Nature's Grace] and allow you to quickly cast a whole host of spells. This is occasionally referred to as "Druid [Heroism]".
Patch changes
Patch 3.1.0 (2009-04-14): Cooldown reduced to 90 seconds.
Patch 3.0.8 (2009-01-20): Instead of canceling shapeshifting, now cancels on shapeshifting into an animal form.
[Nature's Reach]) of the caster. Although it does not cause an especially high amount of damage, it is a 10 second buff that does not require player interference, which allows a druid to have it up while casting other spells and abilities. The buff itself cannot be dispelled or spell stolen.
[Northrend Inscription Research].
Patch 5.0.4 (2012-08-28): Removed. Existing glyphs converted to Glyph of Master Shapeshifter. 
[Glyph of Skull Bash]. 
