Arc

ArcSpell, Chaining, Lightning
Mana Cost: (9 to 26)
Cast Time: 0.80 sec
Critical Strike Chance: 5.00%
Damage Effectiveness: 70%Requires Level 12An arc of lightning stretches from the caster to a targeted nearby enemy and chains on to additional targets.Per 1% Quality:
0.5% chance to Shock enemiesDeals (2-47) to (35-886) Lightning Damage
10% chance to Shock enemies
Chains +(2-7) Times
(10-29)% increased Effect of ShockPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.Acquisition
Level: 12Purchase Costs

Normal

1x Orb of Transmutation

Sell Price
1x Scroll Fragment

For the Vaal-themed counterpart, see Vaal Arc.

Arc is a lightning spell that creates a chaining pulse.

Skill functions and interactions

• Since it is not a projectile, Arc cannot Pierce SupportPierce SupportSupport, Projectile
  Icon: p
  Mana Multiplier: 110%Supports projectile skills.Per 1% Quality:
  Supported Skills deal 0.5% increased Projectile DamageProjectiles from Supported Skills Pierce (2-4) additional Targets
  Supported Skills deal (0-19)% more 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 Fork SupportFork SupportSupport, Projectile
  Icon: Y
  Mana Multiplier: 130%Requires Level 31Supports projectile skills, making their projectiles fork into two projectiles the first time they hit an enemy and don't pierce it.Per 1% Quality:
  Supported Skills deal 0.5% increased Projectile DamageSupported Skills deal (30-11)% less Projectile Damage
  Supported Skills ForkThis 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., and it cannot be supported with GreaterGreater Multiple Projectiles SupportSupport, Projectile
  Icon: P
  Mana Multiplier: 165%Requires Level 38Supports projectile skills.Per 1% Quality:
  Supported Skills have 0.5% increased Attack Speed
  Supported Skills have 0.5% increased Cast SpeedSupported 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. or LesserLesser Multiple Projectiles SupportSupport, Projectile
  Icon: l
  Mana Multiplier: 140%Requires Level 8Supports projectile skills.Per 1% Quality:
  Supported Skills have 0.5% increased Attack Speed
  Supported Skills have 0.5% increased Cast SpeedSupported Skills fire 2 additional Projectiles
  Supported Skills deal (25-16)% 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. Multiple Projectiles. 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:
  Supported Skills have 1% increased Projectile SpeedSupported Skills Chain +2 times
  Supported Skills deal (50-31)% 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.
• Arc, when not cast at any enemy, will target the nearest one within the skill's range.
• 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	9	2 to 35	2	10%	0	0
2	15	39	10	2 to 44	2	11%	15,249	15,249
3	19	48	11	3 to 58	2	12%	41,517	56,766
4	23	56	12	4 to 76	3	13%	81,983	138,749
5	27	64	13	5 to 97	3	14%	147,968	286,717
6	31	73	14	6 to 123	3	15%	250,557	537,274
7	35	81	16	8 to 154	3	16%	405,086	942,360
8	38	88	16	10 to 182	4	17%	447,718	1,390,078
9	41	94	17	11 to 214	4	18%	615,318	2,005,396
10	44	100	18	13 to 250	4	19%	834,639	2,840,035
11	47	106	19	15 to 292	4	20%	1,570,760	4,410,795
12	50	113	20	18 to 340	5	21%	1,633,987	6,044,782
13	53	119	21	21 to 395	5	22%	2,151,030	8,195,812
14	56	125	22	24 to 458	5	23%	2,812,189	11,008,001
15	59	132	23	28 to 529	5	24%	5,099,360	16,107,361
16	62	138	24	32 to 610	6	25%	9,400,731	25,508,092
17	64	142	24	35 to 671	6	26%	15,273,366	40,781,458
18	66	146	25	39 to 736	6	27%	26,286,582	67,068,040
19	68	151	25	43 to 808	6	28%	62,890,590	129,958,630
20	70	155	26	47 to 886	7	29%	212,046,017	342,004,647
21	72	159	26	51 to 971	7	30%	N/A	N/A
22	74	N/A	26	56 to 1064	7	31%	N/A	N/A
23	76	N/A	27	61 to 1164	7	32%	N/A	N/A
24	78	N/A	28	67 to 1274	8	33%	N/A	N/A
25	80	N/A	29	73 to 1393	8	34%	N/A	N/A
26	82	N/A	30	80 to 1523	8	35%	N/A	N/A
27	84	N/A	30	88 to 1663	8	36%	N/A	N/A
28	86	N/A	30	96 to 1816	9	37%	N/A	N/A
29	88	N/A	31	104 to 1983	9	38%	N/A	N/A
30	90	N/A	32	114 to 2163	9	39%	N/A	N/A

Related helmet enchantments

The following helmet enchantments affect Arc

Name		Stats
EnchantmentArcDamage1	66	25% increased Arc Damage
EnchantmentArcDamage2	75	40% increased Arc Damage
EnchantmentArcNumOfAdditionalProjectilesInChain1	66	Arc Chains an additional 2 times
EnchantmentArcNumOfAdditionalProjectilesInChain2	75	Arc Chains an additional 3 times
EnchantmentArcShockChance1	66	Arc has +20% chance to Shock
EnchantmentArcShockChance2	75	Arc has +30% chance to Shock

Alternate skill effects

Name	Cost	Description
Purple Arc Purple ArcArc Skin Stack Size: 20Your Arc becomes a Purple Effect.	120	Replaces the standard effect on an ArcArcSpell, Chaining, Lightning Mana Cost: (9 to 26) Cast Time: 0.80 sec Critical Strike Chance: 5.00% Damage Effectiveness: 70%Requires Level 12An arc of lightning stretches from the caster to a targeted nearby enemy and chains on to additional targets.Per 1% Quality: 0.5% chance to Shock enemiesDeals (2-47) to (35-886) Lightning Damage 10% chance to Shock enemies Chains +(2-7) Times (10-29)% increased Effect of ShockPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. skill gem with a purple effect. Preview

Item acquisition

Quest reward

This skill is given as quest reward for the following quests:

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
The Siren's Cadence Act 1	✓	✗	✗	✗	✗	✗	✗

Vendor reward

This skill 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	✓

Version history

Version	Changes
2.1.0	Damage increased by around 20% higher at level 20. In addition to having more damage, Arc now increases in number of chains more often as it levels up. At level 20, it chains seven times. Previously this was five.
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	ArcArcSpell, Chaining, Lightning Mana Cost: (9 to 26) Cast Time: 0.80 sec Critical Strike Chance: 5.00% Damage Effectiveness: 70%Requires Level 12An arc of lightning stretches from the caster to a targeted nearby enemy and chains on to additional targets.Per 1% Quality: 0.5% chance to Shock enemiesDeals (2-47) to (35-886) Lightning Damage 10% chance to Shock enemies Chains +(2-7) Times (10-29)% increased Effect of ShockPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. and Vaal ArcVaal ArcVaal, Spell, Chaining, Lightning Souls per use: 32 (N) / 48 (C) / 64 (M) Can store 1 use(s) Cast Time: 0.80 sec Critical Strike Chance: 5.00% Damage Effectiveness: 80%Requires Level 12An arc of lightning stretches from the caster to a targeted nearby enemy and chains on to many additional targets.Per 1% Quality: 1.5% increased Shock Duration on enemiesDeals (2-49) to (35-938) Lightning Damage 100% chance to Shock enemies Chains +40 Times CorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. 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.