Contagion

Contagion is a spell that deals chaos damage to all enemies in the area, and spreads when an enemy dies. Neither the duration of Contagion nor associated degeneration effects (Essence DrainEssence DrainSpell, Projectile, Duration, Chaos, AoE
Level: (1-20)
Cost: (8-23) Mana
Cast Time: 0.70 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 60%Requires Level 12Fires a projectile that applies a damage over time debuff when it hits. You are healed for a portion of the debuff damage. The debuff is spread by Contagion.Per 1% Quality:1Superior2Anomalous3Divergent1% increased Chaos DamageRegenerate 0.01% of Debuff Damage as Life5% increased Damage with HitsDeals (31.2-1503.2) Base Chaos Damage per second
Regenerate 0.5% of Debuff Damage as Life
Base duration is 3.8 seconds
Deals (9-433) to (14-649) Chaos Damage
Modifiers to Spell Damage apply to this Skill's Damage Over Time effectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.) are reset when spread to allies on death.

Skill functions and interactions

• Damage over time: Modifiers to spell, chaos damage, and damage over time affect the damage over time component of this spell.
• Area of effect: modifiers to AoE radius (such as #% increased Radius of Area Skills from Increased Area of Effect SupportIncreased Area of Effect SupportSupport, AoE
  Icon: E
  Level: (1-20)
  Cost & Reservation Multiplier: 130%Requires Level 38Supports any skill with an area of effect.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Area DamageSupported Skills have 0.5% increased Attack and Cast SpeedSupported Skills have 0.5% increased Area of EffectSupported Skills have (30-49)% increased Area of EffectThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.) affect both skill radius and spread radius of Contagion and Essence Drain effects. Area damage (from e.g. Concentrated Effect SupportConcentrated Effect SupportSupport, AoE
  Icon: o
  Level: (1-20)
  Cost & Reservation Multiplier: 140%Requires Level 18Supports any skill with an area of effect, regardless of whether that skill deals damage.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Area DamageSupported Skills have 0.5% less Area of EffectSupported Skills have 0.5% reduced Enemy Stun ThresholdSupported Skills have 30% less Area of Effect
  Supported Skills deal (25-39)% more Area DamageThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.) does not apply.
• Contagion does not hit, and therefore cannot confer the effects of supports such as Blind SupportBlind SupportSupport
  Icon: x
  Level: (1-20)
  Cost & Reservation Multiplier: 110%Requires Level 8Supports any skill that hits enemies.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 1% increased Blinding durationSupported Skills have 0.5% chance to Blind enemies on hitSupported Skills have 2% increased Critical Strike Chance against Blinded EnemiesSupported Skills have 10% chance to Blind enemies on hit
  Supported Skills have (0-38)% increased Blinding durationThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. or .
• Can be used in left mouse button slot to cast and move.

Gem level progression

Level				Mana Cost	Chaos Damage per sec	Exp.	Total Exp.
1	4	0	0	5	3.5	0	0
2	6	0	0	6	4.3	841	841
3	9	0	17	6	5.7	3099	3940
4	12	14	21	7	7.4	7433	11373
5	16	18	26	8	10.2	22895	34268
6	20	22	31	9	13.6	49725	83993
7	24	25	37	10	18	95714	179707
8	28	29	42	11	23.3	169595	349302
9	32	33	47	11	29.9	283759	633061
10	36	36	52	12	38.1	453996	1087057
11	40	40	58	13	48.1	703128	1790185
12	44	44	63	14	60.3	1061223	2851408
13	48	48	68	15	75.2	2065870	4917278
14	52	51	74	16	93.3	2507110	7424388
15	55	54	78	16	109.5	2573731	9998119
16	58	57	82	17	128.1	7611351	17609470
17	61	60	86	18	149.6	13437908	31047378
18	64	62	90	18	174.4	25052147	56099525
19	67	65	94	19	203	43869436	99968961
20	70	68	98	20	235.9	242081178	342050139
21	72	70	100	20	260.5	N/A	N/A
22	74	N/A	N/A	21	287.5	N/A	N/A
23	76	N/A	N/A	21	317.2	N/A	N/A
24	78	N/A	N/A	21	349.7	N/A	N/A
25	80	N/A	N/A	22	385.4	N/A	N/A
26	82	N/A	N/A	22	424.5	N/A	N/A
27	84	N/A	N/A	23	467.3	N/A	N/A
28	86	N/A	N/A	23	514.3	N/A	N/A
29	88	N/A	N/A	24	565.7	N/A	N/A
30	90	N/A	N/A	24	621.9	N/A	N/A
31	91	N/A	N/A	24	652	N/A	N/A
32	92	N/A	N/A	25	683.5	N/A	N/A
33	93	N/A	N/A	25	716.5	N/A	N/A
34	94	N/A	N/A	25	750.9	N/A	N/A
35	95	N/A	N/A	25	787	N/A	N/A
36	96	N/A	N/A	25	824.7	N/A	N/A
37	97	N/A	N/A	26	864.1	N/A	N/A
38	98	N/A	N/A	26	905.4	N/A	N/A
39	99	N/A	N/A	26	948.5	N/A	N/A
40	100	N/A	N/A	26	993.6	N/A	N/A

Item acquisition

Upgrade paths

This item can be acquired through the following upgrade paths or vendor recipes:

Amount	Ingredient	General Notes	Type
3	The Bitter BlossomThe Bitter Blossom3Level 21 Chaos Gem Quality: +23% CorruptedThe pain you feel is of no consequence, it is evolution, to be made whole within something greater.	random corrupted superior level 21 Chaos gem with 23% quality	Automatic
8	Dying AnguishDying Anguish8Level 19 Gem Alternative Quality: +19%Moribund, he gazed upon the journey taken as blood trickled down his chin. His eye closed on the city ahead that he would never call home.	random level 19 gem with 19% alternative quality	Automatic
1	Gemcutter's IncubatorGemcutter's IncubatorAdds an incubated Quality Gem item to an equippable item Item drops after killing # monstersQuality GemRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.	random superior gem	Automatic
6	The FoxThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox." - Ezomyte Proverb	random level 20 gem	Automatic
13	The CataclysmThe Cataclysm13Level 21 Spell Gem CorruptedThe mighty warriors traded in blows, the nimble archers in arrows, yet it was the brazen thaumaturgists who would bring catastrophe to all.	random corrupted level 21 Spell gem	Automatic
3	Gemcutter's PromiseGemcutter's Promise3Superior Gem Quality: +20%"I swore to use my position to help the people. What good is power when it just accumulates on the already-powerful?" - Erasmus, Imperial Gemcutter	random superior gem with 20% quality	Automatic
1	The VoidThe Void1Reach into the Void and claim your prize.	random divination card set exchange	Automatic

Quest reward

This item is given as a quest reward for the following quests:

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
Breaking Some Eggs Act 1	✓	✓	✗	✗	✗	✗	✗

Vendor reward

This item can be bought at the listed NPC vendors, after completing the following quests:

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
Breaking Some Eggs Act 1 Nessa	✓	✓	✗	✗	✗	✓	✓
A Fixture of Fate Act 3 Siosa	✓
Fallen from Grace Act 6 Lilly Roth	✓

Alternate skill effects

Name	Cost	Description
Arcane Contagion EffectArcane Contagion EffectSkill Gem EffectYour Contagion becomes a blue arcane effect.	90	Replaces the standard effect on a ContagionContagionSpell, AoE, Duration, Chaos Level: (1-20) Cost: (5-20) Mana Cast Time: 0.60 sec Radius: 20Unleashes a vile contagion on enemies, dealing chaos damage over time. If an enemy dies while affected by Contagion, it spreads to other enemies.Per 1% Quality:1Superior2Anomalous3Divergent0.5% increased Area of Effect3% increased Chaos Damage3% chance to Spread when affected Enemy is HitDeals (3.5-235.9) Base Chaos Damage per second Base duration is 5 seconds Modifiers to Spell Damage apply to this Skill's Damage Over Time effectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. skill gem with a blue arcane effect. Preview

Related helmet enchantments

The following helmet enchantments affect Contagion.

Name		Stats	Spawn Weighting
Enchantment Contagion Damage 1	66	25% increased Contagion Damage	helmet 100 default 0
Enchantment Contagion Damage 2	75	40% increased Contagion Damage	helmet 100 default 0
Enchantment Contagion Duration 1	66	20% increased Contagion Duration	helmet 100 default 0
Enchantment Contagion Duration 2	75	30% increased Contagion Duration	helmet 100 default 0
Enchantment Contagion Radius 1	66	16% increased Contagion Area of Effect	helmet 100 default 0
Enchantment Contagion Radius 2	75	24% increased Contagion Area of Effect	helmet 100 default 0

Version history

Version	Changes
2.6.0	Contagion's radius has increased from 18 to 20 units.
2.2.1d	Fixed an instance crash with Contagion.
2.1.1c	Fixed an instance crash with [...] Contagion.
2.1.1b	Fixed a bug where Contagion could be cast and spread through walls.
2.1.1	Contagion can now be supported by Iron Will.
2.1.0	Added to the game.