Wrath

Wrath is a direct damage offensive spell that deals nature damage. The ability is amongst the few spells that druids begin with. It is one of the three abilities (Starfire, Starsurge, and Wrath) that affect the Eclipse mechanic that Balance druids rely on as of patch 4.0.1.

Mastery

 * Moonfury Arcane and Nature spell damage increased by 15%. Increases the critical strike bonus damage by 100% (crits go from 150% damage to 200% damage).
 * Total Eclipse increases the bonus damage from Eclipse by 12% (from 25% to 37%). Each point of Mastery increases the bonus by an additional 1.5%.

Talents

 * Balance of Power increases your Arcane and Nature spell damage by 1/2% and converts 50/100% of your Spirit to Spell Hit.
 * Earth and Moon causes your Wrath spell to apply the Earth and Moon effect on your target, increasing magical damage done to that target by 8% for 12 seconds. Also increases your spell damage by 2%.
 * Euphoria: When not in an Eclipse state, you have a 12/24% chance to double the Eclipse energy generated by Wrath. When you reach Eclipse, you are instantly restored 6/12% of your total Mana.
 * Master Shapeshifter increases spell damage by 4% while in Moonkin form.
 * Moonglow (druid talent) reduces the Mana cost of Wrath by 3% per point for 3 points. (9% max)
 * Moonkin Form increases Nature spell damage by 10% while in form.
 * Nature's Grace: You gain 5/10/15% spell haste after casting Moonfire or Insect Swarm. One minute cooldown.  Cooldown reset when you gain Eclipse.  Lasts 15 seconds.
 * Nature's Majesty increases the critical strike chance of your Wrath spell by 2% per point for 2 points. (4% max)
 * Owlkin Frenzy: Attacks done to you while in Moonkin form have a 5/10/15% chance to cause you to go into a frenzy, increasing your spell damage by 10% and causing you to be immune to Pushback while casting Balance spells. Lasts 10 seconds.
 * Starlight Wrath reduces the cast time of Wrath by .15/.25/0.5 seconds.

Tips and tactics

 * More often than not, casting Wrath in PvP will be more effective than trying to cast the much longer Starfire spell.
 * When fighting a class that can counterspell, you may find it better to cast Starfire instead of Wrath as the only druid spells that are not in the Nature magic school are Starfire, Moonfire, Starfall, and Starsurge.