Iridescence

In the Devastation Evoker talent tree, Iridescence sits in the Devastation specialization talents, row 10 of 11. It is a single-point node. Its row opens once 20 points are spent in Devastation Talents.

Connected above

The tree draws a line into Iridescence from Power Swell.

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  Power Swell

  Casting an empower spell increases your Essence regeneration rate by 100% for 4 sec.

Same row

Also on this row: Strafing Run, Scorching Embers, Causality and Scintillation.

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  Strafing Run

  Deep Breath deals 20% reduced damage and can be cast again within 18 sec of being used. Recall will be available after the second cast if talented.

• 
  Scorching Embers

  Enemies affected by Fire Breath's damage over time effect take 25% increased damage from your Red spells.

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  Causality
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  Scintillation

  Disintegrate has a 15% chance each time it deals damage to launch a level 1 Eternity Surge at 40% power.