Nightfall (warlock talent)

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Nightfall
Nightfall (2 ranks) Gives your Corruption and Drain Life spells a X% chance to cause you to enter a Shadow Trance state after damaging the opponent. The Shadow Trance state reduces the casting time of your next Shadow Bolt spell by 100%.
Requirements
Class	Warlock
Properties
Affects	Corruption, [Drain Life], [Shadow Bolt]
Related buff
Magic Shadow Trance Your next Shadow Bolt becomes an instant cast spell. Duration: 10 seconds

Nightfall is a warlock talent that gives [Drain Life] and [Corruption] a chance to grant the warlock an instant Shadow Bolt each time either spell ticks.

Rank table

Rank	Shadow Trance chance
1	2%
2	4%

Functionality

This is a passive ability similar to [Backlash].

Tips

All levels of Corruption have the same chance to proc. Since recent changes nerf your use of lower level spells (using +dps instead of damage from the spell) you can use this to tremendous effect in instances and raids. Allow the tank to build aggro then apply level 1 Corruption to each target except the main. This will generate negligible threat but counts toward procing nightfall. It also has the added effect of causing the [Shadow Embrace].

Notes

One of the main reasons why warlocks put points into the Affliction talent tree, Nightfall can dramatically increase your damage output, assuming it actually activates.

Nightfall does not proc when you cast [Corruption] or [Drain Life]. Instead, Nightfall has a 4% chance to proc EVERY time a Corruption or Drain Life spell ticks damage on an enemy target. Corruption ticks every 3 seconds, but can be placed on multiple targets to greatly increase your chances of proccing Nightfall. Drain Life ticks every 1 second. A common tactic against a single target is to place Corruption on the target, and then repeatedly Drain Life until Nightfall procs.

A given casting of Corruption has a 21.7% chance of proccing Nightfall on one or more ticks. A given casting of Drain Life has an 18.5% chance of proccing Nightfall on one or more ticks.

Multiple procs of Nightfall do not stack. You only receive one Nightfall instant-cast Shadow Bolt at a time. It can, however, proc multiple times from the same Corruption/Drain Life spell.

Though it states that it makes your next Shadow Bolt an instant-cast, the buff only lasts for 8 seconds, and you must cast the spell in that window for it to be instant.