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Arc

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Arc
Active skill gem
  
Attribute(s)Intelligence
KeywordsLightning, Spell, Chaining
Required Level19
Cast time0.8 secs
Radius45
Critical Strike Chance5%
Damage effectiveness50%
Per 1% Quality+0.5% chance to Shock enemy on hit with Lightning Damage
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
Chains 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.

Note that there is a 50% damage reduction 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 19 48 11 3–50 2 81,983
2 23 56 12 3–65 2 63,765
3 25 60 13 4–74 2 135,415
4 28 67 13 5–89 2 199,345
5 31 73 14 7–125 2 285,815
6 34 79 14 6–107 3 401,344
7 37 85 15 8–150 3 554,379
8 40 92 16 9–177 3 755,049
9 43 98 27 11–208 3 1,016,533
10 46 104 18 13–244 3 1,355,511
11 49 111 19 15–285 4 1,791,769
12 52 117 20 17–332 4 1,498,138
13 54 121 21 19–368 4 1,790,934
14 56 125 22 21–406 4 3,351,223
15 58 130 22 24–448 4 9,922,564
16 60 134 23 26–494 5 21,318,990
17 62 138 23 29–545 5 50,639,372
18 64 142 25 32–600 5 89,968,595
19 66 146 25 35–660 5 146,938,899
20 68 151 26 38–726 5 N/A
21 68 151 26 42–797 6 N/A
22 68 151 26 46–876 6 N/A
23 68 151 27 51–961 6 N/A|-
24 68 151 - 55–1054 - N/A
25 68 151 - 61–1155 - N/A
26 68 151 - 67–1266 - N/A
27 68 151 30 73–1386 7 N/A

Quest reward

This skill can be gained as a reward for finishing quests:

Intruders in Black (Act 2 / Normal) by:
  • Templar
  • Witch
  • Shadow
Lost in Love (Act 3 / Cruel) by:
  • Templar
  • Shadow
  • Scion

Version history

Version Changes
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.