Thought Harvester

In the Shadow Priest talent tree, Thought Harvester sits in the Shadow specialization talents, row 3 of 11. It is a single-point node.

Connected above

The tree draws a line into Thought Harvester from Psychic Link.

• 
  Psychic Link

  Your direct damage spells inflict 20% of their damage on all other targets afflicted by your Vampiric Touch. Does not apply to damage from Shadowy Apparitions, Shadow Word: Pain, and Vampiric Touch.

Connected below

Thought Harvester leads on to Tormenting Whispers.

• 
  Tormenting Whispers

  Increases Shadow Word: Madness damage by 15%.

Same row

Also on this row: Tentacle Slam and Shadowy Apparitions.

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  Tentacle Slam

  Summons a massive shadowy appendage to slam the ground, dealing (68.8% of Spell Power) Shadow damage in front of you and 8 yds around your target. Applies Vampiric Touch to up to 6 enemies, prioritizing ones without Vampiric Touch. Generates 6 Insanity.

• 
  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.