Crushing Void

In the Shadow Priest talent tree, Crushing Void sits in the Shadow specialization talents, row 9 of 11. It is a single-point node. Its row opens once 20 points are spent in Shadow Talents.

Connected above

The tree draws a line into Crushing Void from Maddening Tentacles.

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  Maddening Tentacles

  Tentacle Slam afflicts your target with Shadow Word: Madness at 25% effectiveness.

Connected below

Crushing Void leads on to Idol of C'Thun.

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  Idol of C'Thun

  Mind Flay has a chance to spawn a Void Tendril that channels Mind Flay or Void Lasher that channels Mind Sear at your target. Assaults the target's mind with Shadow energy, causing (321.8% of Spell Power) Shadow damage over 10 sec and slowing their movement speed by 30%. Generates 5 Insanity over the duration. Corrosive shadow energy radiates from the target, dealing Shadow damage over 10 sec to all enemies of the target. Damage reduced beyond 5 targets. Generates 5 Insanity over the duration.

Same row

Also on this row: Inescapable Torment, Madness Weaving, Death's Torment, Screams of the Void, Tormented Spirits and Insidious Ire.

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  Inescapable Torment
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  Madness Weaving2 ranks

  The damage bonus from your Mastery: Shadow Weaving gains 50% additional benefit from Shadow Word: Madness.

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  Death's Torment

  Shadow Word: Death deals damage 2 additional times at 15% effectiveness.

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  Screams of the Void2 ranks

  Shadow Word: Madness causes your Shadow Word: Pain and Vampiric Touch to deal damage 40% faster on all targets for 3 sec.

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  Tormented Spirits

  Your Shadow Word: Pain damage has a chance to create Shadowy Apparitions that float towards all targets afflicted by your Vampiric Touch. Critical strikes increase the chance by 100%.

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  Insidious Ire2 ranks

  While you have Shadow Word: Pain, Shadow Word: Madness, and Vampiric Touch active on the same target, your Mind Blast, Void Torrent, Mind Flay, and Void Volley deal 20% more damage.