Mental Decay

In the Shadow Priest talent tree, Mental Decay sits in the Shadow specialization talents, row 5 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 Mental Decay from Surge of Insanity.

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  Surge of Insanity

  Mind Flay damage increased by 15% and Insanity generation increased by 30%.

Connected below

Mental Decay leads on to Shadeburst, Dark Evangelism and Shattered Psyche.

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  Shadeburst
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  Dark Evangelism

  Increases your periodic spell damage by 6%.

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  Shattered Psyche

  Lasts 10 sec.

Same row

Also on this row: Shadowy Insight, Voidtouched, Voidform and Haunting Shadows.

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  Shadowy Insight

  Shadow Word: Pain periodic damage has a chance to cause your next Mind Blast to be instant and ignore its cooldown.

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  Voidtouched

  Increases your Shadow Word: Madness damage by 6% and increases your maximum Insanity by 50.

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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.