|Suppression, Improved Corruption, Improved Drain Soul, Grim Reach, Nightfall, Empowered Corruption, Shadow Embrace, Shadow Mastery, Contagion, Demonic Knowledge, Pandemic, Everlasting Affliction|
|Level||Mana Cost||Damage over time||Duration|
Corruption is a simple damage over time spell which effects a magic debuff on the target, causing shadow damage. The effect of this spell can be majorly enhanced with talents (see below) and gear. The spell lasts from 12 to 18 seconds, depending on which rank of the spell is being used (see above). As with most DoTs, once cast it inflicts damage upon its victim every three seconds, and continues until either the effect wears off, or the spell's victim has met its end. This spell cannot normally generate critical hits (without talent improvement).
It has a standard spell power coefficient of 120%, as predicted by the 18 second duration of the effect. This can further boosted with the Empowered Corruption talent, the effects of which are explained in detail in the next section.
Improved Corruption provides Corruption with a potentially significant bonus to damage - up to 10% at Rank 5. Note: Prior to Patch 3.0.2, this talent reduced the cast time of Corruption. The spell is now instant cast by default, even with no talent points invested.
Shadow Mastery will increase damage dealt by Corruption by 15% at max rank, Contagion by 5%, and Demonic Knowledge will increase damage depending on the pet you currently have out. Empowered Corruption increases the bonus damage coefficient from your spell damage bonus by 12% per point, and Everlasting Affliction adds an additional 6% of your spell damage bonus per point (1% per point per tick). Maxing out these two talents will increase the overall spell power coefficient to 120% base + 36% Empowered Corruption + 30% Everlasting Affliction = 186% total.
Glyph of Quick Decay is a Major Glyph that was added to the game in Patch 3.3.0. It decreases the time between the damage ticks of Corruption by an amount equal to your haste. With this Glyph active the warlock talent Eradication also decreases the time between Corruption damage ticks, even though Eradication does not specifically say it increases haste. This Glyph does not increase the number of DoT ticks, but rather decreases the amount of time Corruption takes to deal its full duration of damage. In this way the time between Corruption ticks is reduced as stated by the Glyph.
Tips and tactics
Corruption is considered a bread and butter 'staple' ability of warlocks. When supported with talents, it is quite mana efficient; it provides 2.00 dmg per mana in its level 77 incarnation, or up to 2.20 dmg per mana with the damage bonus from Improved Corruption factored in.
Corruption is usually preferable to Curse of Agony in short fights. This is because Corruption's damage is spread evenly over its duration, and its duration is only 75% that of Curse of Agony (18 seconds vs. 24 seconds). While CoA is more mana efficient (4.52 dmg per mana at max level), that efficiency is lost if the target dies before CoA completes its cycle (especially since CoA deals 50% of its damage in the last one-third of its cycle).
Corruption can be cast with your target behind you, and since it is instant cast it can also be cast while running. As such, this ability is excellent for kiting enemies. Since walking backward is much slower than running forward or strafe-running, it is always best to do one of the latter two things while attempting to kite something.
- / Patch 3.0.2 (14-Oct-2008): Now instant-cast.
- Patch 1.8.0 (10-Oct-2005): Duration reduced and damage per tick increased. Total damage over duration approximately identical.