Arc
ArcSpell, Chaining, Lightning
Mana Cost: (8-23)
Cast Time: 0.70 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 80%Requires Level 12An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.Per 1% Quality:1Superior2Anomalous3Divergent4Phantasmal0.5% chance to Shock enemies1% increased Chaining range0.5% increased Damage for each time this Skill has Chained1% reduced Enemy Stun ThresholdDeals (6-133) to (33-754) Lightning Damage
10% chance to Shock enemies
Chains +(4-7) Times
(10-29)% increased Effect of Lightning Ailments
15% more Damage for each remaining ChainPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Acquisition
Level: 12Purchase Costs
Sell Price
1x Scroll FragmentMiscellaneous
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemArc
Mana Cost: (8-23)
Cast Time: 0.70 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 80%Requires Level 12An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.Per 1% Quality:1Superior2Anomalous3Divergent4Phantasmal0.5% chance to Shock enemies1% increased Chaining range0.5% increased Damage for each time this Skill has Chained1% reduced Enemy Stun ThresholdDeals (6-133) to (33-754) Lightning Damage
10% chance to Shock enemies
Chains +(4-7) Times
(10-29)% increased Effect of Lightning Ailments
15% more Damage for each remaining ChainPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.


Level: 12Purchase Costs
Normal | 1x Orb of Transmutation |
1x Scroll FragmentMiscellaneous
Item class: Active Skill Gems
Metadata ID: Metadata/Items/Gems/SkillGemArc

For the Vaal-themed counterpart, see Vaal Arc.
Arc is a lightning spell that creates a chaining pulse.
Contents
Skill functions and interactions
- Since it is not a projectile, Arc cannot fork or pierce, and it cannot be supported with
Lesser Multiple Projectiles SupportLesser Multiple Projectiles SupportSupport, Projectile
Icon: l
Mana Multiplier: 140%Requires Level 8Supports projectile skills.Per 1% Quality:123Supported Skills have 0.5% increased Attack Speed
Supported Skills have 0.5% increased Cast SpeedSupported Skills have 1% reduced Mana Cost
Supported Skills have 0.5% increased Projectile SpeedProjectiles Fired by Supported Skills have 1% increased Projectile spreadSupported Skills fire 2 additional Projectiles
Supported Skills deal (15-6)% less 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 Active Skill Gem you wish to augment. Right click to remove from a socket.or
Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, Projectile
Icon: P
Mana Multiplier: 165%Requires Level 38Supports projectile skills.Per 1% Quality:123Supported Skills have 0.5% increased Attack Speed
Supported Skills have 0.5% increased Cast SpeedSupported Skills have 1% reduced Mana Cost
Supported Skills have 0.5% increased Projectile SpeedProjectiles Fired by Supported Skills have 1% increased Projectile spreadSupported Skills fire 4 additional Projectiles
Supported Skills deal (35-26)% less 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 Active Skill Gem you wish to augment. Right click to remove from a socket..
- Supporting Arc with
Chain SupportChain SupportSupport, Chaining, Projectile
Icon: c
Mana Multiplier: 150%Requires Level 38Supports projectile skills, and any other skills that chain.Per 1% Quality:123Supported Skills have 1% increased Projectile SpeedSupported Skills have 1% increased Chaining rangeProjectiles Fired by Supported Skills have 4% chance not to Pierce EnemiesSupported Skills Chain +2 times
Supported Skills deal (30-11)% less Damage with HitsThis 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.will result in additional chains.
- Arc will chain to a random target within a specified radius centered on last target struck. Arc cannot chain back to the same target immediately, and must bounce one more time before chaining to the previous target. Because Arc also forks with each bounce, it requires 4 grouped enemies to bounce back to the original.
- Arc will target the nearest enemy within range if not cast on an enemy.
- Can be used in left mouse button slot to cast and move.
Gem level progression
Level | ![]() | ![]() | Mana Cost | Lightning Damage | Chains | Shock Effect | Exp. | Total Exp. |
---|---|---|---|---|---|---|---|---|
1 | 12 | 33 | 8 | 6 to 33 | +4 | N/A | 0 | 0 |
2 | 15 | 39 | 9 | 7 to 41 | +4 | N/A | 15,249 | 15,249 |
3 | 19 | 48 | 10 | 9 to 54 | +4 | N/A | 41,517 | 56,766 |
4 | 23 | 56 | 11 | 12 to 70 | +4 | N/A | 81,983 | 138,749 |
5 | 27 | 64 | 12 | 16 to 89 | +4 | N/A | 147,968 | 286,717 |
6 | 31 | 73 | 13 | 20 to 112 | +5 | N/A | 250,557 | 537,274 |
7 | 35 | 81 | 14 | 25 to 139 | +5 | N/A | 405,086 | 942,360 |
8 | 38 | 88 | 15 | 29 to 163 | +5 | N/A | 447,718 | 1,390,078 |
9 | 41 | 94 | 16 | 34 to 191 | +5 | N/A | 615,318 | 2,005,396 |
10 | 44 | 100 | 16 | 39 to 223 | +5 | N/A | 834,639 | 2,840,035 |
11 | 47 | 106 | 17 | 46 to 258 | +6 | N/A | 1,570,760 | 4,410,795 |
12 | 50 | 113 | 18 | 53 to 299 | +6 | N/A | 1,633,987 | 6,044,782 |
13 | 53 | 119 | 19 | 61 to 346 | +6 | N/A | 2,151,030 | 8,195,812 |
14 | 56 | 125 | 19 | 70 to 399 | +6 | N/A | 2,812,189 | 11,008,001 |
15 | 59 | 132 | 20 | 81 to 458 | +6 | N/A | 5,099,360 | 16,107,361 |
16 | 62 | 138 | 21 | 93 to 526 | +7 | N/A | 9,400,731 | 25,508,092 |
17 | 64 | 142 | 21 | 102 to 577 | +7 | N/A | 15,273,366 | 40,781,458 |
18 | 66 | 146 | 22 | 111 to 631 | +7 | N/A | 26,286,582 | 67,068,040 |
19 | 68 | 151 | 22 | 122 to 690 | +7 | N/A | 62,890,590 | 129,958,630 |
20 | 70 | 155 | 23 | 133 to 754 | +7 | N/A | 212,046,017 | 342,004,647 |
21 | 72 | 159 | 24 | 145 to 824 | +8 | N/A | N/A | N/A |
22 | 74 | N/A | 24 | 159 to 900 | +8 | N/A | N/A | N/A |
23 | 76 | N/A | 25 | 173 to 982 | +8 | N/A | N/A | N/A |
24 | 78 | N/A | 25 | 189 to 1070 | +8 | N/A | N/A | N/A |
25 | 80 | N/A | 26 | 206 to 1167 | +8 | N/A | N/A | N/A |
26 | 82 | N/A | 26 | 224 to 1271 | +9 | N/A | N/A | N/A |
27 | 84 | N/A | 27 | 244 to 1384 | +9 | N/A | N/A | N/A |
28 | 86 | N/A | 27 | 266 to 1506 | +9 | N/A | N/A | N/A |
29 | 88 | N/A | 28 | 289 to 1639 | +9 | N/A | N/A | N/A |
30 | 90 | N/A | 28 | 314 to 1782 | +9 | N/A | N/A | N/A |
31 | 91 | N/A | 28 | 328 to 1858 | +10 | N/A | N/A | N/A |
32 | 92 | N/A | 29 | 342 to 1937 | +10 | N/A | N/A | N/A |
33 | 93 | N/A | 29 | 356 to 2019 | +10 | N/A | N/A | N/A |
34 | 94 | N/A | 29 | 371 to 2105 | +10 | N/A | N/A | N/A |
35 | 95 | N/A | 29 | 387 to 2193 | +10 | N/A | N/A | N/A |
36 | 96 | N/A | 30 | 403 to 2286 | +11 | N/A | N/A | N/A |
37 | 97 | N/A | 30 | 420 to 2382 | +11 | N/A | N/A | N/A |
38 | 98 | N/A | 30 | 438 to 2482 | +11 | N/A | N/A | N/A |
39 | 99 | N/A | 30 | 456 to 2586 | +11 | N/A | N/A | N/A |
40 | 100 | N/A | 31 | 475 to 2694 | +11 | N/A | 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 |
---|---|---|---|
6 | ![]() ![]() ![]() - Ezomyte Proverb ![]() | random level 20 gem | Automatic |
13 | ![]() ![]() ![]() 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 | ![]() ![]() ![]() 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 (Q20) | Automatic |
Quest reward
This item is given as a quest reward for the following quests:
Class → | Witch | Shadow | Ranger | Duelist | Marauder | Templar | Scion |
---|---|---|---|---|---|---|---|
Quest ↓ | |||||||
The Siren's Cadence 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 ↓ | |||||||
The Siren's Cadence 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 Arc.
Name | ![]() | Stats | Spawn Weighting |
---|---|---|---|
Enchantment Arc Damage 1 | 66 | 25% increased Arc Damage | helmet 100 default 0 |
Enchantment Arc Damage 2 | 75 | 40% increased Arc Damage | helmet 75 default 0 |
Enchantment Arc Damage Per Chain 1 | 66 | Arc deals 8% increased Damage for each time it has Chained | helmet 100 default 0 |
Enchantment Arc Damage Per Chain 2 | 75 | Arc deals 12% increased Damage for each time it has Chained | helmet 75 default 0 |
Enchantment Arc Num Of Additional Projectiles In Chain 1 | 75 | Arc Chains an additional time | helmet 75 default 0 |
Enchantment Arc Shock Chance 1 | 66 | Arc has +20% chance to Shock | helmet 100 default 0 |
Enchantment Arc Shock Chance 2 | 75 | Arc has +30% chance to Shock | helmet 75 default 0 |
Alternate skill effects
Arc has the following alternate skill effects:
Item | Effect(s) |
---|---|
Automaton Arc Effect![]() ![]() | Your Arc becomes an Automaton Effect. |
Celestial Arc Effect![]() ![]() | Your Arc becomes a Celestial Effect. |
Purple Arc![]() ![]() | Your Arc becomes a Purple Effect. |
Version history
Version | Changes |
---|---|
3.11.0 |
|
3.9.0 |
|
3.6.2 |
|
3.6.0 |
|
3.3.0 |
|
3.0.0 |
|
2.1.0 |
|
2.0.0 |
|
1.3.1 |
|
1.2.0 |
|
1.1.2 |
|
1.0.0 |
|
0.11.1 |
|
0.9.13 |
|