Eclipse

The Eclipse mechanic is available to all Druids who have specced into Balance, and is active while the Druid is in caster or Moonkin forms. The druid gains an Eclipse Bar showing his current amount of Lunar or Solar energy; a pointer on the bar indicates which type of energy the Druid is currently able to gain. When the bar reaches 100 energy, it will trigger an Eclipse effect, and switch the type of energy the Druid is able to gain; Solar and Lunar eclipses will thus always alternate. The Eclipse effect increases damage done by Nature/Arcane spells; the bonus is increased by the Balance Druid mastery, Total Eclipse.

The usual rotation is to cast Starsurge whenever it is off cooldown, and to cast whichever of Wrath or Starfire that will grant you energy.

Lunar Eclipse
Lunar Eclipse becomes active when the Druid reaches 100 Lunar Energy. Lunar Energy is generated by casting Wrath (13 points per cast) or Starsurge (15 points per cast).

Lunar Eclipse benefits all Druid abilities that deal Arcane damage:
 * Moonfire
 * Starfire
 * Starsurge
 * Starfall (druid ability)

Solar Eclipse
Solar Eclipse becomes active when the Druid reaches 100 Solar Energy. Solar Energy is generated by casting Starfire (20 points per cast) or Starsurge (15 points per cast).

Solar Eclipse benefits all Druid abilities that deal Nature damage:
 * Wrath
 * Insect Swarm
 * Sunfire (Moonfire through Sunfire (druid talent) talent)
 * Hurricane
 * Typhoon
 * Wild Mushroom
 * Starsurge

Improvements

 * Euphoria talent causes your Wrath and Starfire to sometimes generate double energy.
 * Total Eclipse (Mastery) increases the damage bonus provided by Solar and Lunar Eclipse effects.
 * Sunfire (druid talent) allows Moonfire to benefit from Solar Eclipse as well as Lunar Eclipse.