Shadeburst

In the Shadow Priest talent tree, Shadeburst sits in the Shadow specialization talents, row 6 of 11. It is a single-point node. Its row opens once 8 points are spent in Shadow Talents.

Connected above

The tree draws a line into Shadeburst from Voidform, Haunting Shadows and Mental Decay.

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  Voidform

  Bombards your target with a Void Volley and twists your Shadowform with void magic, increasing your spell damage by 20% for 20 sec. During Voidform, Void Volley replaces this spell and can be used up to 3 times. Releases a volley of pure void energy, firing 10 bolts at your target and 1 boltsbolt at all enemies of your target for (95.4% of Spell Power) Shadow damage. Generates 10 Insanity.

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  Haunting Shadows

  Shadowy Apparition damage increased by 10%. When Shadowy Apparitions deal damage, they extend the duration of your Shadow Word: Pain and Vampiric Touch on the target by 1.1 sec.

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  Mental Decay

  Increases the damage of Mind Flay by 25%.

Connected below

Shadeburst leads on to Spectral Horrors and Instilled Doubt.

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  Spectral Horrors

  Shadow Apparitions deal 30% increased damage to targets affected by your Shadow Word: Madness.

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  Instilled Doubt2 ranks

  Increases the critical strike chance of Vampiric Touch and Shadow Word: Pain by 8% and their critical strike damage by 20%.

Same row

Also on this row: Shadowfiend, Dark Thoughts, Maddening Touch, Improved Voidform or Ancient Madness, Dark Evangelism and Shattered Psyche.

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  Shadowfiend

  Shadow Word: Death has a 40% chance to summon a Shadowfiend for 5 sec when damaging targets below 20% health. Summons a Shadowfiend to attack your target for 5 sec. Generates 1 Insanity each time the Shadowfiend attacks.

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  Dark Thoughts

  Increases the chance for Shadowy Insight to occur by 25%. When consuming Shadowy Insight, Mind Blast generates 1 additional Insanity.

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  Maddening Touch

  Vampiric Touch deals 20% additional damage and has a chance to generate 1 Insanity each time it deals damage.

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  Improved Voidform

  Voidform increases your spell damage by an additonal 5% and grants 2 additional uses of Void Volley.

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  Ancient Madness

  When Voidform ends, the haste lingers and decays over 10 sec.

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  Dark Evangelism

  Increases your periodic spell damage by 6%.

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  Shattered Psyche

  Lasts 10 sec.