---
title: "Arc"
summary: "Arc: Lightning that leaps between enemies. Can shock, making them take more damage."
status: in-game  # Exists in the current build; generated from or checked against its code
section: "Wiki"
html: arc.html
source: generated by www/wiki/*.ts from the game data (data/game.json) + lore in www/content/wiki/skills/arc.md
---

# Arc

[In game]

Lightning that leaps between enemies. Can shock, making them take more damage.

- **Type:** Spell
- **Mana cost:** 8 at level 1
- **Speed:** 1.25 casts per second
- **Damage:** 2–20 Lightning
- **Critical chance:** 5%

Lore [Concept]

> Lightning goes looking for the next body, the way rumour goes through Hearthold.

## How it works

Strikes the enemy nearest your cursor (within 3 tiles of it, up to 13.5 tiles from you, in line of sight); with nobody near the cursor it takes the nearest enemy in a narrow cone toward it. From there it leaps up to 4 more times (more with additional chains, up to 7 in all), each time to the nearest enemy within 8 tiles that it hasn't hit yet. Every enemy hit gets its own damage roll. Its leap distance is not affected by area of effect.

## Scales with

- [Increased lightning damage](../../wiki/stats.md#inclight)
- [Increased spell damage](../../wiki/stats.md#incspell)
- [Increased damage](../../wiki/stats.md#incdamage)
- [Increased cast speed](../../wiki/stats.md#castspeed)
- [Increased critical strike chance](../../wiki/stats.md#inccrit)
- [Critical strike multiplier](../../wiki/stats.md#critmulti)
- [Spell skill level](../../wiki/stats.md#spelllevel)
- [Additional chains](../../wiki/stats.md#extrachains)

## Damage by gem level

Base damage before any increases, critical strikes or resistances. A gem is as strong as a character of the level it requires (1.12 times per level of that), and each +1 to the level of spell skills counts as one more such level.

| Type | Gem 1 | Gem 5 | Gem 10 | Gem 15 | Gem 20 | Gem 25 | Gem 30 |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Lightning | 2–20 | 6–62 | 67–671 | 647–6474 | 4978–49782 | 27249–272486 | 149147–1491469 |

## As a gem

A Intelligence gem with the tags Spell, Chaining, Lightning. It requires 9 Intelligence at gem level 1; 120 Intelligence at gem level 10; 257 Intelligence at gem level 20; 365 Intelligence at gem level 30. Support gems that fit it: [Faster Casting](../../wiki/skills/support-gems.md#faster_casting), [Elemental Focus](../../wiki/skills/support-gems.md#elemental_focus), [Chain](../../wiki/skills/support-gems.md#chain), [Critical Strikes](../../wiki/skills/support-gems.md#critical_strikes).

## Mana cost by level

Costs grow 3.5% per level the gem requires, with the gem at the highest level a character of each level can use; support gems multiply it.

|  | Lv 1 | Lv 2 | Lv 5 | Lv 10 | Lv 20 | Lv 30 | Lv 40 | Lv 50 | Lv 75 | Lv 100 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Mana | 8 | 8 | 9 | 10 | 13 | 16 | 19 | 21 | 28 | 36 |

Other skills: [Strike](../../wiki/skills/strike.md), [Earthshatter](../../wiki/skills/earthshatter.md), [Fireball](../../wiki/skills/fireball.md), [Frost Nova](../../wiki/skills/frost-nova.md), [Ember Dash](../../wiki/skills/ember-dash.md)