Caustic ArrowAttack, Projectile, AoE, Duration, Chaos, Bow Level: (1-20) Cost: (6-10) Mana Attack Damage: (55-64)% of base Effectiveness of Added Damage: (55-64)% Projectile Speed: 3260 AoE Radius: 20Fires 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.Base duration is 2 seconds Deals (8.8-1927.1) Base Chaos Damage per second 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
Additional Effects From 1-20% Quality: 0.5% increased Area of Effect1% chance to inflict Withered for 2 seconds on Hit1% of Physical Damage Converted to Chaos DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
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 SupportSlower Projectiles SupportSupport, Projectile Icon: J Level: (1-20) Cost & Reservation Multiplier: 120%Requires Level 31Supports projectile skills.Supported Skills have (20-30)% less Projectile Speed Supported Skills deal (10-19)% more Projectile Damage
Additional Effects From 1-20% Quality: Supported Skills deal (0.5-10)% increased Projectile 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 Skill Gem you wish to augment. Right click to remove from a socket.) that increase projectile damage will increase both the damage on hit and the area of effect damage.
Concentrated Effect: 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.Supported Skills deal (25-39)% more Area Damage Supported Skills have 30% less Area of Effect
Additional Effects From 1-20% Quality: Supported Skills deal (0.5-10)% increased 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 Skill Gem you wish to augment. Right click to remove from a socket. 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.[1]
Point Blank: Point Blank does not affect the damage from caustic ground; it only affects projectile attack damage.[2]
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 SupportIron Grip SupportProjectile, Physical, Support Icon: i Level: (1-20) Cost & Reservation Multiplier: 110%Requires Level 18Supports attack skills that fire projectiles, making the increase to physical melee damage from strength also increase their physical projectile damage.Strength's Damage bonus applies to Projectile Attack Damage as well for Supported Skills Supported Skills deal (0-38)% increased Projectile Damage
Additional Effects From 1-20% Quality: Supported Skills deal (0.5-10)% increased Projectile 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 Skill Gem you wish to augment. Right click to remove from a socket. 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 SupportCulling Strike SupportSupport Icon: X Level: (1-20) Cost & Reservation Multiplier: 110%Requires Level 18Supports any skill that hits enemies. If enemies are left below 10% of maximum life after being hit by these skills, they will be killed.Kill Enemies that have 10% Life or lower when Hit by Supported Skills Supported Skills deal (0-38)% increased Damage
Additional Effects From 1-20% Quality: Recover (0.1-2)% of Life when Supported Skills Cull an EnemyThis 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 Skill Gem you wish to augment. Right click to remove from a socket. 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 MarkSniper's MarkSpell, Curse, Mark Level: (1-20) Cost: (16-33) Mana Cast Time: 0.50 secRequires Level 4Curses a single enemy, increasing the damage they take from projectiles, and making projectiles split when hitting them, to hit other targets around them. You can only have one Mark at a time.Cursed enemies take (10-29)% increased Damage from Projectile Hits Projectiles which Hit Cursed Enemies Split towards 2 additional targets
Additional Effects From 1-20% Quality: Cursed enemies take (0.25-5)% increased Damage from Projectile HitsPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. requires the target to be hit. The caustic ground won't be affected by it.[3][confirmation needed because of 3.12 change]DespairDespairSpell, AoE, Duration, Chaos, Curse, Hex Level: (1-20) Cost: (16-33) Mana Cast Time: 0.50 sec AoE Radius: 22Requires Level 24Curses all targets in an area, lowering their chaos resistance.Base duration is (8.00-11.80) seconds +(0-1) metre to radius Cursed enemies have -(15-30)% to Chaos Resistance
Additional Effects From 1-20% Quality: (0.5-10)% increased Effect of CursePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. does affect the caustic ground.
Gem level progression
Level
Mana Cost
Damage Effectiveness
Attack Damage
Chaos Damage per sec
Radius
Exp.
Total Exp.
1
1
0
6
55%
55%
8.8
N/A
0
0
2
2
0
6
55%
55.5%
10.1
N/A
70
70
3
4
16
6
56%
56%
13.1
N/A
308
378
4
7
22
6
56%
56.5%
18.4
N/A
1554
1932
5
11
31
7
57%
57%
27.8
N/A
6667
8599
6
16
41
7
57%
57.5%
44
N/A
26047
34646
7
20
50
7
58%
58%
61.9
N/A
49725
84371
8
24
58
7
58%
58.5%
85.4
N/A
95714
180085
9
28
67
8
59%
59%
116.2
N/A
169595
349680
10
32
75
8
59%
59.5%
156.3
N/A
283759
633439
11
36
83
8
60%
59.9%
208.5
N/A
453996
1087435
12
40
92
8
60%
60.4%
275.9
N/A
703128
1790563
13
44
100
9
61%
60.9%
362.7
N/A
1061223
2851786
14
48
109
9
61%
61.4%
474.1
N/A
2065870
4917656
15
52
117
9
62%
61.9%
616.9
N/A
2507110
7424766
16
56
125
9
62%
62.4%
799.3
N/A
5798936
13223702
17
60
134
10
63%
62.9%
1031.8
N/A
15083919
28307621
18
64
142
10
63%
63.4%
1327.6
N/A
27792735
56100356
19
67
148
10
64%
63.9%
1600.8
N/A
43869739
99970095
20
70
155
10
64%
64.4%
1927.1
N/A
242081556
342051651
21
72
159
11
65%
64.9%
2179.2
N/A
N/A
N/A
22
74
N/A
11
65%
65.4%
2462.7
N/A
N/A
N/A
23
76
N/A
11
66%
65.9%
2781.5
N/A
N/A
N/A
24
78
N/A
11
66%
66.4%
3139.9
N/A
N/A
N/A
25
80
N/A
12
67%
66.9%
3542.6
N/A
N/A
N/A
26
82
N/A
12
67%
67.4%
3995
N/A
N/A
N/A
27
84
N/A
12
68%
67.9%
4503.1
N/A
N/A
N/A
28
86
N/A
12
68%
68.4%
5073.4
N/A
N/A
N/A
29
88
N/A
13
69%
68.9%
5713.4
N/A
N/A
N/A
30
90
N/A
13
69%
69.4%
6431.6
N/A
N/A
N/A
31
91
N/A
13
70%
69.8%
6822.8
N/A
N/A
N/A
32
92
N/A
13
70%
70.3%
7237.1
N/A
N/A
N/A
33
93
N/A
14
71%
70.8%
7675.8
N/A
N/A
N/A
34
94
N/A
14
71%
71.3%
8140.3
N/A
N/A
N/A
35
95
N/A
14
72%
71.8%
8632.2
N/A
N/A
N/A
36
96
N/A
14
72%
72.3%
9152.9
N/A
N/A
N/A
37
97
N/A
15
73%
72.8%
9704.1
N/A
N/A
N/A
38
98
N/A
15
73%
73.3%
10287.7
N/A
N/A
N/A
39
99
N/A
15
74%
73.8%
10905.4
N/A
N/A
N/A
40
100
N/A
15
74%
74.3%
11559.3
N/A
N/A
N/A
Gem quality
Type
Additional Effects per 1-20% Quality
Weight
Superior
+(0.01-0.2) metres to radius
1
Item acquisition
Caustic Arrow can drop anywhere.
Recipes
Caustic Arrow can be created from the following recipes:
Amount
Part
Description
Meta
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 corruptedlevel 21 Chaos gem with 23% quality
A
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
A
3
Gemcutter's PromiseGemcutter's Promise3Gem 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 gem with 20% quality
A
1
Gemcutter's IncubatorGemcutter's IncubatorStack Size: 10Adds an incubated Quality Gem item to an equippable item Item drops after killing {0} monstersRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.
Random gem with 1–20% quality
A
1
The VoidThe Void1Reach into the Void and claim your prize.
Random divination card set exchange
A
Quest reward
This item is given as a quest reward for the following quests:
Note that helmet enchantments are no longer obtainable since version 3.23.0 and can only be obtained in permanent leagues as already enchanted items from before this patch.
Caustic Arrow's damage over time grows more quickly as it levels, up to 765 base Chaos damage per second at gem level 20 (up from 550.3). It is also now modified by projectile damage modifiers.
Poison Arrow has been renamed to Caustic Arrow as part of the poison changes. The damage of this skill has been increased by around 37% at level 1, but reduced by around 42% by level 20. This reduction is more than compensated for by supporting the skill with the new supports. Caustic Arrow's mana costs have been increased, from 5 to 8 at level one, and from 13 to 16 at level 20.
Added new skill prototype: "Poison Arrow" (Fires an arrow which explodes in a cloud of poison. Enemies who enter the cloud are poisoned for a short time, taking chaos damage)
Slower Projectiles SupportSlower Projectiles SupportSupport, Projectile
) that increase projectile damage will increase both the damage on hit and the area of effect damage.
Concentrated Effect SupportConcentrated Effect SupportSupport, AoE
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.[1]
Iron Grip SupportIron Grip SupportProjectile, Physical, Support
will increase the damage from caustic ground, but the strength bonus the support gem shares with the keystone will not apply.
Culling Strike SupportCulling Strike SupportSupport
applies to the damage from caustic ground, but the caustic ground will not kill enemies instantly when they have less than 10% life.
Sniper's MarkSniper's MarkSpell, Curse, Mark
requires the target to be hit. The caustic ground won't be affected by it.[3][confirmation needed because of 3.12 change] 
DespairDespairSpell, AoE, Duration, Chaos, Curse, Hex
does affect the caustic ground.
The Bitter Blossom
The Bitter Blossom
3Level 21 Chaos Gem
The Fox
6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox."
Gemcutter's Promise
3Gem
Gemcutter's IncubatorGemcutter's IncubatorStack Size: 10Adds an incubated Quality Gem item to an equippable item
The Void
1Reach into the Void and claim your prize.
Celestial Caustic Arrow EffectSkill Gem EffectYour Caustic Arrow becomes a Celestial Effect.
Oblivion Caustic Arrow EffectSkill Gem EffectYour Caustic Arrow becomes an Oblivion Effect.
Tentacle Caustic Arrow EffectSkill Gem EffectYour Caustic Arrow becomes an area of ethereal purple tentacles.