Sudden Onset

In the Affliction Warlock talent tree, Sudden Onset sits in the Affliction specialization talents, row 7 of 11. It is a single-point node. Its row opens once 8 points are spent in Affliction Talents.

Connected above

The tree draws a line into Sudden Onset from Practiced Pestilence.

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  Practiced Pestilence

  Mastery increased by 2%.

Connected below

Sudden Onset leads on to Shard Instability and Niskaran Methods.

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  Shard Instability

  Damage dealt by Drain Soul has a 10% chance to make your next Unstable Affliction or Seed of Corruption cost no Soul Shards and cast instantly.

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  Niskaran Methods

  Increases damage dealt by Agony and Wither by 10%.

Same row

Also on this row: Malediction, Eye Contract, Malefic Grasp, Nether Plating, Sacrolash's Dark Strike and Contagion.

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  Malediction

  Increases the critical strike chance of Agony, Wither, and Unstable Affliction by 5%.

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  Eye Contract

  Increases the duration of Summon Darkglare by 5.1 sec.

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  Malefic Grasp

  While Darkglare is active, your Drain Soul becomes Malefic Grasp. Binds the target in twilight, dealing (1053% of Spell Power) Shadow damage over 4 sec. When Malefic Grasp deals damage, it causes all of your other periodic Affliction damage effects to instantly deal 30% of their normal periodic damage.

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  Nether Plating

  Adorns your Darkglare with armor forged from within Antorus, increasing their armor by 10%. Eye Beam now jumps to up to 4 additional targets within 10 yards and deals 10% increased damage.

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  Sacrolash's Dark Strike
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  Contagion

  Increases critical strike damage dealt by Agony, Wither, and Unstable Affliction by 15%.