Surge of Insanity

In the Shadow Priest talent tree, Surge of Insanity sits in the Shadow specialization talents, row 4 of 11. It is a single-point node.

Connected above

The tree draws a line into Surge of Insanity from Shadowy Apparitions.

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  Shadowy Apparitions

  Shadow Word: Madness conjures Shadowy Apparitions that float towards all targets afflicted by your Vampiric Touch for (85% of Spell Power) Shadow damage.

Connected below

Surge of Insanity leads on to 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%.

Same row

Also on this row: Tormenting Whispers and Descending Darkness.

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  Tormenting Whispers

  Increases Shadow Word: Madness damage by 15%.

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  Descending Darkness

  Increases Tentacle Slam damage by 300%.