|stat_text = Deals (1.9-86.7) Base [[Chaos]] Damage per second<br>Modifiers to [[Spell]] Damage apply to [[Debuff]]'s Damage over Time<br>[[Debuff]] deals 100% more Damage for each<br>time it has spread, up to 300%<br>Spread radius is 1.7 metres<br>[[Debuff]] duration is 5 seconds
|stat_text = Deals (1.9-93.9) Base [[Chaos]] Damage per second<br>Modifiers to [[Spell]] Damage apply to [[Debuff]]'s Damage over Time<br>[[Debuff]] deals 100% more Damage for each<br>time it has spread, up to 300%<br>Spread radius is 1.7 metres<br>[[Debuff]] duration is 5 seconds
|level1 = True
|level1 = True
|level1_level_requirement = 0
|level1_level_requirement = 0
|level1_cost_amounts = 9
|level1_cost_amounts = 8
|level1_stat_text = Deals 1.9 Base Chaos Damage per second
|level1_stat_text = Deals 1.9 Base Chaos Damage per second
* The base damage scaling of all player spell and secondary damage skills has been tweaked to scale better in the late game. Generally speaking, spells that do not have damage number changes called out below will have near-identical base damage at low levels, roughly 5% more damage at gem level 20, and roughly 20% more damage at gem level 30.
* The base damage scaling of all player spell and secondary damage skills has been tweaked to scale better in the late game. Generally speaking, spells that do not have damage number changes called out below will have near-identical base damage at low levels, roughly 5% more damage at gem level 20, and roughly 20% more damage at gem level 30.
* Contagion: Quality now provides Contagion targets 0-2 additional Enemies when Cast, instead of +0-100% to Maximum Debuff Damage bonus from spreading.
* Contagion: Quality now provides Contagion targets 0-2 additional Enemies when Cast, instead of +0-100% to Maximum Debuff Damage bonus from spreading.
* Removed "Barrageable" gem tag. {{undocumented}}
}}
}}
{{Version history table row|0.2.1|
{{Version history table row|0.2.1|
* Added "Barrageable" gem tag.{{undocumented}}
* Added "Barrageable" gem tag. {{undocumented}}
}}
}}
{{Version history table row|0.2.0|
{{Version history table row|0.2.0|
Latest revision as of 19:29, 31 August 2025
ContagionSpell, AoE, Chaos, Duration Tier: 1 Level: (1-20) Cost: (8-83) Mana Cast Time: 1.00 secAfflict a single enemy with a Debuff that deals Chaos damage over time. If the enemy dies while affected by Contagion, it and all other Chaos damage over time Debuffs spread to nearby enemies and refresh their durations. Reanimating or detonating a corpse affected by Contagion will cause the Minion or explosion to spread Contagion on hit.Deals (1.9-93.9) Base Chaos Damage per second Modifiers to Spell Damage apply to Debuff's Damage over Time Debuff deals 100% more Damage for each time it has spread, up to 300% Spread radius is 1.7 metres Debuff duration is 5 seconds
Additional Effects From 1-20% Quality: Contagion targets (0.1-2) additional Enemies when CastSkills can be managed in the Skills Panel.
Acquisition Drop restricted It can be obtained by engraving an Uncut Skill Gem.Metadata Item class: Skill Gem Metadata ID: Metadata/Items/Gems/SkillGemContagion
Contagion is an AoEChaosDurationSpellSkill that applies a spreading ChaosDamage over timeDebuff. Enemies killed while having the debuff will spread Contagion and any other Chaos damage over time debuffs on them to nearby enemies.
Enemies that are affected by Essence DrainEssence DrainBarrageable, Spell, Projectile, Chaos, Duration Tier: 3 Level: (1-20) Cast Time: 0.80 sec Critical Strike Chance: 7.00%Fire a Projectile that applies a powerful Chaos damage over time debuff to enemies it hits.Projectile Deals (5-129) to (9-240) Chaos Damage
Damage over Time Modifiers to Spell Damage apply to Debuff's Damage over Time Debuff duration is 4 seconds Deals (9.2–409.4) Base Chaos Damage per second
Additional Effects From 1-20% Quality: +(0–1) second to Debuff durationSkills can be managed in the Skills Panel.'s damage over timedebuff appear to be prioritized targets when casting Contagion.
Contagion also spreads curses similarly to the damage over time debuff regardless of whether or not Decaying HexDecaying HexSupport, Chaos, Curse Category: Decaying Hex Tier: 3 Cost & Reservation Multiplier: 130%Support Requirements: +5 IntSupports Curse skills. Cursed enemies' bodies decay, taking Chaos damage over time.Supported Skills inflict Decay, dealing 100% of Intelligence as Chaos damage per second for 8 secondsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill. is linked to the curse.[1][2] This is particularly synergistic with DespairDespairSpell, AoE, Chaos, Duration, Curse Tier: 9 Level: (1-20) Cost: (41-178) Mana Cast Time: 0.70 secCurse all targets in an area after a short delay, lowering their ChaosResistance.Curse applies after 1.5 seconds delay Curse inflicts -(35-49)% to Chaos Resistance Curse radius is (1.5-3.1) metres Curse duration is (6-7.4) seconds Curse does not apply to enemies above level (20-0)
Additional Effects From 1-20% Quality: (0.5-10)% increased CurseMagnitudesSkills can be managed in the Skills Panel. or Temporal ChainsTemporal ChainsSpell, AoE, Duration, Curse Tier: 7 Level: (1-20) Cost: (41-178) Mana Cast Time: 0.70 secCurse all enemies in an area, Slowing them and making other effects on them expire more slowly.Curse applies after 1.5 seconds delay Curse radius is (1.5-3.1) metres CurseSlows targets by (40-59)% Curse duration is (6-7.4) seconds Curse makes other effects on targets expire 25% slower Curse does not apply to enemies above level (20-0)
Additional Effects From 1-20% Quality: (0.5-10)% increased CurseMagnitudesSkills can be managed in the Skills Panel..
Gem level progression
Level
Mana Cost
Chaos Damage
1
0
0
8
1.9
2
3
9
9
2.8
3
6
14
11
4.1
4
10
21
13
5.5
5
14
28
15
7.2
6
18
35
17
9.1
7
22
41
19
11.2
8
26
48
22
13.7
9
31
57
25
16.5
10
36
65
28
19.7
11
41
74
32
23.4
12
46
82
36
27.6
13
52
92
40
32.5
14
58
103
45
38
15
64
113
50
44.4
16
66
116
55
51.7
17
72
126
61
60.1
18
78
137
68
69.8
19
84
147
75
81
20
90
157
83
93.9
Recommended support gems
The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.
Gem tier
Support gems
I
Magnified Area IMagnified Area ISupport, AoE Category: Increased Area of Effect Tier: 1 Cost & Reservation Multiplier: 130%Support Requirements: +5 IntSupports any skill with an area of effect, making it larger.Supported Skills have 35% increased Area of EffectPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Minion Pact IMinion Pact ISupport, Minion Category: Minion Pact Tier: 1Support Requirements: +5 IntSupports damaging skills you use yourself, draining the life from one of your Minions on use in order to boost the skill's damage. Only takes effect if you have a Minion with enough life to drain the full amount.Supported Skills remove 100% of your maximum Life from a nearby Minion on use to deal 30% more damagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Profanity IProfanity ISupport, Chaos Category: Profanity Tier: 1Support Requirements: +5 IntSupports Skills you use yourself. Supported Skills consume a Corpse on use, dealing more Chaos Damage if they do. Cannot support Triggered Skills or Reservation Skills.Supported Skills consume a Corpse within 5 metres on use, if possible Supported Skills deal 30% more Chaos Damage if consuming a CorpsePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
II
AcrimonyAcrimonySupport Category: Acrimony Tier: 2 Cost & Reservation Multiplier: 110%Support Requirements: +5 IntSupports Skills which can Damage Enemies. Enemies affected by Damage over time from Supported Skills which was not caused by a Damaging Ailment have reduced Life regeneration rate. Only the strongest instance of this Debuff will apply. Does not Support Skills used by Minions.Enemies affected by non-Ailment Damage over time from Supported Skills have 50% reduced Life regeneration ratePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Intense AgonyIntense AgonySupport, Spell, Duration Category: Intense Agony Tier: 2Support Requirements: +5 IntSupports Spells that deal non-Ailment damage over time, causing them to have a shorter duration but deal substantially more damage over time with Debuffs inflicted against enemies on full life.Damage over time with non-AilmentDebuffs inflicted on full-life enemies by Supported Skills deal 50% more damage Supported Skills have 25% less Skill Effect DurationPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
III
Chaotic FreezeChaotic FreezeSupport, Spell, Chaos Category: Chaotic Freeze Tier: 3Support Requirements: +5 IntSupports Spells that deal non-AilmentChaos damage over time. Enemies taking damage over time from Debuffs caused by supported skills will suffer Freeze build up from Chaos damage Hits from any source. Does not Support Skills used by Minions.Chaos damage Contributes to Freeze buildup for Hits against targets taking damage over time from Supported SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Drain AilmentsDrain AilmentsSupport, Spell Category: Drain Ailments Tier: 3Support Requirements: +5 IntSupports Spells that deal non-Ailment damage over time, causing them to consume Ailments on enemies it applies damage over time Debuffs to in order to deal substantially more damage over time.Supported Skills Consume all Ailments of a random type on the target when inflicting damage over time Debuffs, causing the Debuff to deal 35% more damage if any Ailments were consumedPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Prolonged Duration IIProlonged Duration IISupport, Duration Category: Prolonged Duration Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that has a duration, making that duration longer.Supported Skills have 35% more Skill Effect DurationPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV
DerangeDerangeSupport Category: Derange Tier: 4Support Requirements: +5 IntSupports Skills which you use yourself which can deal damage. Supported Skills gain an Energy Shield cost equal to your Intelligence, while also dealing more non-Ailment Damage over time based off of your Intelligence. Cannot support Channelling Skills.Supported Skills gain an Energy Shield cost equal to your Intelligence Supported Skills deal 8% more non-Ailment Damage over time per 100 IntelligencePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Minion Pact IIMinion Pact IISupport, Minion Category: Minion Pact Tier: 4Support Requirements: +5 IntSupports damaging skills you use yourself, draining the life from one of your Minions on use in order to boost the skill's damage. Only takes effect if you have a Minion with enough life to drain the full amount.Supported Skills remove 150% of your maximum Life from a nearby Minion on use to deal 35% more damagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
V
Chaos MasteryChaos MasterySupport, Chaos Category: Mastery Tier: 5Support Requirements: +5 IntSupports Chaos skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Chaos SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Profanity IIProfanity IISupport, Chaos Category: Profanity Tier: 5Support Requirements: +5 IntSupports Skills you use yourself. Supported Skills consume many Corpses on use, dealing more Chaos Damage per Corpse consumed. Cannot support Triggered Skills or Reservation Skills.Supported Skills consume up to 10 Corpses within 5 metres on use, if possible Supported Skills deal 5% more Chaos Damage for each Corpse consumed this wayPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Item acquisition
Contagion has restrictions on where or how it can drop.
The base damage scaling of all player spell and secondary damage skills has been tweaked to scale better in the late game. Generally speaking, spells that do not have damage number changes called out below will have near-identical base damage at low levels, roughly 5% more damage at gem level 20, and roughly 20% more damage at gem level 30.
Contagion: Quality now provides Contagion targets 0-2 additional Enemies when Cast, instead of +0-100% to Maximum Debuff Damage bonus from spreading.
Many Skills have had their base damage and/or damage growth per level rebalanced. Most of these changes are not specifically mentioned below as the changes are too widespread.
Increased the damage growth per level on Essence Drain, Contagion, Profane Ritual and Chaos Bolt (Wand Skill). Results in approximately 33% more damage at Gem Level 25.
Essence DrainEssence DrainBarrageable, Spell, Projectile, Chaos, Duration
's damage over time debuff appear to be prioritized targets when casting Contagion.
Decaying HexDecaying HexSupport, Chaos, Curse
is linked to the curse.[1][2] This is particularly synergistic with 
DespairDespairSpell, AoE, Chaos, Duration, Curse
or 
Temporal ChainsTemporal ChainsSpell, AoE, Duration, Curse
.
Magnified Area IMagnified Area ISupport, AoE
Minion Pact IMinion Pact ISupport, Minion
Profanity IProfanity ISupport, Chaos
AcrimonyAcrimonySupport
Intense AgonyIntense AgonySupport, Spell, Duration
Chaotic FreezeChaotic FreezeSupport, Spell, Chaos
Drain AilmentsDrain AilmentsSupport, Spell
Prolonged Duration IIProlonged Duration IISupport, Duration
DerangeDerangeSupport
Chaos MasteryChaos MasterySupport, Chaos
