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Arc

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Arc
Active skill gem
  
Attribute(s)Intelligence
KeywordsLightning, Spell, Chaining
Required Level12
Cast time0.8 secs
Radius45
Critical Strike Chance5%
Damage effectiveness70%
Per 1% Quality+0.5% chance to Shock enemies
An arc of lightning stretches from the caster to a targeted nearby enemy and chains on to additional targets.
Deals x–y Lightning Damage
10% chance to Shock enemies
Chain +x Times
Screenshot of Arc

Arc is a lightning spell that creates a chaining pulse.

Skill Functions and Interactions

Since it is not a projectile, Arc cannot Pierce or Fork, and it cannot be supported with Greater or Lesser Multiple Projectiles. Supporting Arc with Chain 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.

Arc, when not cast at any enemy, will target the nearest one within the skill's range.

Note that there is a 50% damage effectiveness on this gem, meaning all additional damage (including from Support Gems) will be halved.

Gem level progression

Level Lvl. Int. Mana
Cost
Lightning
Damage
Chains Exp.
1 12 33 9 2–29 2 15,249
2 15 39 10 2–36 2 41,517
3 19 48 11 3–48 2 81,983
4 23 56 12 3–63 2 147,968
5 27 64 13 4–81 2 250,557
6 31 73 14 5–102 3 405,086
7 35 81 16 7–129 3 447,718
8 38 88 16 8–152 3 615,318
9 41 94 17 9–178 3 834,639
10 44 100 18 11–209 3 1,570,760
11 47 106 19 13–244 4 1,633,987
12 50 113 20 15–284 4 2,151,030
13 53 119 21 17–329 4 2,812,189
14 56 125 22 20–381 4 5,099,360
15 59 132 23 23–441 4 9,400,731
16 62 138 24 27–508 5 15,273,366
17 64 142 24 29–559 5 26,286,582
18 66 146 25 32–614 5 62,890,590
19 68 151 25 35–673 5 212,046,017
20 70 155 26 39–738 5 N/A
21 72 26 43–809 6 N/A
22 74 26 47–886 6 N/A
23 76 27 51–970 6 N/A
24 78 28 56–1062 6 N/A
25 80 29 61–1161 6 N/A
26 82 30 67–1269 7 N/A
27 84 30 73–1386 7 N/A
28 86 30 80–1514 7 N/A
29 88 31 86–1652 7 N/A
30 90 32 95–1802 7 N/A

Quest reward

This skill is given as quest reward for the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Siren's Cadence
Act 1
Normal
no
no
yes
no
no
no
no

Vendor reward

This skill can be bought at the listed npc vendors after completing the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Siren's Cadence
Act 1
Nessa
no
yes
yes
yes
no
no
no

Version history

Version Changes
2.0.0
  • Damage reduced slightly at all levels. At player level 68, it should deal approximately 8% less damage.
1.2.0
  • We have reduced the damage by 15% at all levels.
  • Got +1% to critical hit chance bringing it to 5%
1.1.2
  • Arc and Vaal Arc have had their damage increased by 60%. Arc and Vaal Arc can now no longer chain back to the same target immediately, but must now bounce one more time. Arc now increases in chain counts as the gem increases in level.
1.0.0
  • Reduced the mana cost.
  • Damage has been increased by around 23%.
0.11.1
  • Spells with Damage Effectiveness no longer have their own damage affected by Damage Effectiveness.
    Damage values on these skills have been updated to reflect this.
0.9.13
  • Arc has been added to the game.