Caustic Arrow - Path of Exile

Caustic Arrow is an active skill gem.

Fires an arrow which deals chaos damage in an area on impact, and spreads caustic ground. Enemies standing on the caustic ground take chaos damage over time.

Attack, Projectile, AoE, Duration, Chaos, Bow. Level: 1–20. Cost: 6–10 Mana. Effectiveness of Added Damage: 55–64%. Projectile Speed: 3260. Radius: 20. Requires Level 1.

Deals (8.8–1927.1) Base Chaos Damage per second
Base duration is 2 seconds
60% of Physical Damage Converted to Chaos Damage
Modifiers to Projectile Damage apply to this Skill"s Damage Over Time effect
+(0–6) to radius

Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Name	Additional Effects From Quality	Weight
Caustic Arrow	(0–10)% increased Area of Effect	50

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Related Gems

Name	Additional Effects From Quality	Weight
Caustic Arrow	(0–10)% increased Area of Effect	50
Anomalous Caustic Arrow	(0–20)% chance to inflict Withered for 2 seconds on Hit	100
Divergent Caustic Arrow	(0–20)% of Physical Damage Converted to Chaos Damage	100

Level Effect

Level	Requires Level	Dexterity	Cost	Base Damage	Deals 8.8 Base Chaos Damage per second	# to radius	Experience
1	1	10	6	55%	8.8	0	70
2	2	12	6	55.5%	10.1	0	308
3	4	16	6	56%	13.1	1	1,554
4	7	22	6	56.5%	18.4	1	6,667
5	11	31	7	57%	27.8	1	26,047
6	16	41	7	57.5%	44	2	49,725
7	20	50	7	58%	61.9	2	95,714
8	24	58	7	58.5%	85.4	2	169,595
9	28	67	8	59%	116.2	3	283,759
10	32	75	8	59.5%	156.4	3	453,996
11	36	83	8	59.9%	208.5	3	703,128
12	40	92	8	60.4%	275.9	3	1,061,223
13	44	100	9	60.9%	362.7	4	2,065,870
14	48	109	9	61.4%	474.1	4	2,507,110
15	52	117	9	61.9%	616.9	4	5,798,936
16	56	125	9	62.4%	799.3	5	15,083,919
17	60	134	10	62.9%	1031.9	5	27,792,735
18	64	142	10	63.4%	1327.6	5	43,869,739
19	67	148	10	63.9%	1600.8	6	242,081,556
20	70	155	10	64.4%	1927.1	6
21	72		11	64.9%	2179.2	6
22	74		11	65.4%	2462.7	7
23	76		11	65.9%	2781.5	7
24	78		11	66.4%	3139.9	7
25	80		12	66.9%	3542.6	8
26	82		12	67.4%	3995	8
27	84		12	67.9%	4503.1	8
28	86		12	68.4%	5073.4	9
29	88		13	68.9%	5713.5	9
30	90		13	69.4%	6431.6	9
31	91		13	69.8%	6822.8	9
32	92		13	70.3%	7237.1	10
33	93		14	70.8%	7675.8	10
34	94		14	71.3%	8140.3	10
35	95		14	71.8%	8632.2	11
36	96		14	72.3%	9152.9	11
37	97		15	72.8%	9704.2	11
38	98		15	73.3%	10287.7	12
39	99		15	73.8%	10905.4	12
40	100		15	74.3%	11559.3	12

Caustic Arrow is a bow attack that fires an arrow dealing chaos damage and spreading caustic ground. Enemies standing within it receive a debuff that deals chaos damage over time. Caustic ground does not poison and is therefore not affected by poison-related modifiers.

Skill functions and interactions

Caustic Arrow will explode either at the targeted location or on the first monster or obstacle it hits.

Multiple projectiles: firing additional projectiles can spread caustic ground over a wider area, but the damage over time from overlapping patches of caustic ground does not stack.

Piercing: piercing Caustic Arrow projectiles will spread caustic ground each time they hit and will receive the chaos damage bonus any time they impact an enemy.

Projectile damage: passive nodes and gems (such as Slower Projectiles Support) that increase projectile damage will increase both the damage on hit and the area of effect damage.

Concentrated Effect: Concentrated Effect Support decreases the size of the AoE and increase its damage. However, due to the nature of the skill and the wording of its modifiers, the damage increase will not appear on the tooltip.

Point Blank: Point Blank does not affect the damage from caustic ground; it only affects projectile attack damage.

Iron Grip: The strength bonus from the Iron Grip keystone passive does not affect the damage from caustic ground because it is not considered an attack nor is it based on physical damage. The increased projectile damage portion of the Iron Grip Support will increase the damage from caustic ground, but the strength bonus the support gem shares with the keystone will not apply.

Accuracy: The projectile attack is subject to accuracy and can miss. However, the explosion will spread caustic ground and do damage regardless of whether the projectile attack hits or misses. Piercing Caustic Arrow will not spread caustic ground if it misses.

Duration: modifiers to duration will affect the duration of the caustic ground.

Culling strike: The increased damage from Culling Strike Support applies to the damage from caustic ground, but the caustic ground will not kill enemies instantly when they have less than 10% life.

Curses: Sniper's Mark requires the target to be hit. The caustic ground won't be affected by it.[confirmation needed because of 3.12 change] Despair does affect the caustic ground.

Item acquisition

Caustic Arrow can drop anywhere. Drop level: 5.

Recipes

Caustic Arrow can be created from the following recipes:

Amount	Part	Description
3	The Bitter Blossom	Random corrupted level 21 Chaos gem with 23% quality
6	The Fox	Random level 20 gem
8	Dying Anguish	Random level 19 gem with 19% alternative quality
8	The Hook	Random corrupted level 21 gem with 23% alternative quality
3	Gemcutter's Promise	Random gem with 20% quality
1	Gemcutter's Incubator	Random gem with 1–20% quality
1	The Void	Random divination card set exchange

Quest reward

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

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

Related helmet enchantments

The following helmet enchantments affect Caustic Arrow.

Name	Level	Labyrinth	Stats	Spawn Weighting
Enchantment Caustic Arrow Damage 1	66	Merciless Labyrinth	25% increased Caustic Arrow Damage	helmet 75 default 0
Enchantment Caustic Arrow Damage 2	75	Eternal Labyrinth	40% increased Caustic Arrow Damage	helmet 75 default 0
Enchantment Caustic Arrow Duration 1	66	Merciless Labyrinth	20% increased Caustic Arrow Duration	helmet 75 default 0
Enchantment Caustic Arrow Duration 2	75	Eternal Labyrinth	30% increased Caustic Arrow Duration	helmet 75 default 0
Enchantment Caustic Arrow Area Of Effect 1	66	Merciless Labyrinth	16% increased Caustic Arrow Area of Effect	helmet 75 default 0
Enchantment Caustic Arrow Area Of Effect 2	75	Eternal Labyrinth	24% increased Caustic Arrow Area of Effect	helmet 75 default 0
Enchantment Caustic Arrow Wither On Hit 1	66	Merciless Labyrinth	Caustic Arrow has 14% chance to inflict Withered on Hit for 2 seconds base Duration	helmet 75 default 0
Enchantment Caustic Arrow Wither On Hit 2	75	Eternal Labyrinth	Caustic Arrow has 20% chance to inflict Withered on Hit for 2 seconds base Duration	helmet 75 default 0

Alternate skill effects

Caustic Arrow has the following alternate skill effects:

Item	Effect(s)
Celestial Caustic Arrow Effect	Your Caustic Arrow becomes a Celestial Effect.
Tentacle Caustic Arrow Effect	Your Caustic Arrow becomes an area of ethereal purple tentacles.