Contagion

ContagionBarrageable, Spell, AoE, Chaos, Duration
Tier: 1
Level: 1
Cast Time: 1.00 secAffects 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 1.8 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:
Debuff deals 0% more damage for each time it has spread, up to (0-100)%Skills 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 AoE Chaos Duration Spell Skill that applies a spreading Chaos Damage over time Debuff. Enemies killed while having the debuff will spread Contagion and any other Chaos damage over time debuffs on them to nearby enemies.

Skill functions and interactions

Enemies that are affected by Essence DrainEssence DrainBarrageable, Spell, Projectile, Chaos, Duration
Tier: 3
Level: 1
Cast Time: 0.80 sec
Critical Strike Chance: 7.00%Fires a Projectile that applies a powerful Chaos damage over time debuff to enemies it hits.Deals (5–126) to (9–234) Chaos Damage
Modifiers to Spell Damage apply to Debuff's Damage over Time
Debuff duration is 4 seconds
Deals (8–217.5) Base Chaos Damage per second

Additional Effects From 1-20% Quality:
Debuff Duration is (0-1) secondsSkills can be managed in the Skills Panel.'s damage over time debuff 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
Tier: 1
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 copies of the same Support Gem socketed at the same time. is linked to the curse. This is particularly synergistic with DespairDespairBarrageable, Spell, AoE, Chaos, Duration, Curse
Tier: 9
Level: (1-20)
Cost: (42-251) Mana
Cast Time: 0.70 secCurses all targets in an area after a short delay, lowering their Chaos Resistance.Curse applies after 1 second delay
Cursed enemies have (-36-30)% to Chaos Resistance
Curse radius is (1.5–2.1) metres
Curse duration is (6–7.4) seconds

Additional Effects From 1-20% Quality:
Curse radius is (0–0.2) metersSkills can be managed in the Skills Panel. or Temporal ChainsTemporal ChainsBarrageable, Spell, AoE, Duration, Curse
Tier: 13
Level: 1
Cast Time: 0.70 secCurses all enemies in an area, Slowing them and making other effects on them expire more slowly.Curse applies after 1 second delay
Curse radius is (1.5–2.1) metres
Curse duration is (6–7.4) seconds
Other effects on Cursed enemies expire 25% slower
Cursed enemies are Slowed by (22–28)%

Additional Effects From 1-20% Quality:
+(0–10)% increased Effect of CurseSkills can be managed in the Skills Panel..

Gem level progression

Level
1

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	PersistencePersistenceSupport, Duration Tier: 1 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that has a duration, making that duration longer.Supported Skills have 40% 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 copies of the same Support Gem socketed at the same time.	ProfanityProfanitySupport, Chaos 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 copies of the same Support Gem socketed at the same time.	Swift AfflictionSwift AfflictionSupport, Duration Tier: 1Support Requirements: +5 DexSupports any skill that deals damage, causing it to deal more damage over time but have a shorter duration.Supported Skills deal 30% more non-Ailment Damage over Time 20% less Duration of Supported Skills and Damaging Ailments they inflictPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
II	AcrimonyAcrimonySupport 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 copies of the same Support Gem socketed at the same time.	HinderHinderSupport, Spell, Chaos Tier: 2Support Requirements: +5 IntSupports Spells that deal non-Ailment Chaos damage over time, causing damage over time they inflict to also Hinder enemies. Does not Support Skills used by Minions.Chaos damage over time inflicted by Supported Skills also Hinders enemiesPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.	Intense AgonyIntense AgonySupport, Spell, Duration 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-Ailment Debuffs 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 copies of the same Support Gem socketed at the same time.
III	Chaotic FreezeChaotic FreezeSupport, Spell, Chaos Tier: 3Support Requirements: +5 IntSupports Spells that deal non-Ailment Chaos 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 copies of the same Support Gem socketed at the same time.	DerangeDerangeSupport Tier: 3Support 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 copies of the same Support Gem socketed at the same time.	Drain AilmentsDrain AilmentsSupport, Spell 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 copies of the same Support Gem socketed at the same time.

Item acquisition

Contagion has restrictions on where or how it can drop.

It can be obtained by engraving an Uncut Skill Gem.

Alternate skill effects

Contagion has the following alternate skill effects:

Item	Description

Version history

Version	Changes
0.2.1	Added "Barrageable" gem tag.[Undocumented]
0.2.0	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.
0.1.0e	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.
0.1.0d	Fixed a bug where the Contagion Skill was not spreading Poison.
0.1.0	Introduced to the game.