Quantum Computing: LoL Arena Augment

Quantum Computing is a prismatic augment in League of Legends Arena.

Overview

Automatically cast an improved version of Tactical Sweep, winding over 0.75 seconds to slash in a 650 radius around you. The slash deals physical damage to enemies within the area (12 seconds cooldown). Enemies hit by the outer edge of the circle take bonus physical damage equal to 10% (+ 2.5% per 100 bonus AD) (+ 1.6% per 100 AP) (+ 0.1% per 100 bonus health) of their maximum health and are slow decaying over 2 seconds. Additionally, you are heal for a part of the bonus post-mitigation damage against enemy champions hit by the outer edge.²

Per level³

Level	Effect
1	150+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow.
2	225+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow.
3	300+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow.Max-level effect: Your automatic effects have 25% / 10% / 1% chance to multi-cast.

ArenaSweats stats

2026 Season 3 Act 2, all regions

SArenaSweats tierS tier

Pick %: 1.39%
Games: 446,496
Champions: 173

Best champions with it

Full stats on ArenaSweats PagesFrom ranked Arena games tracked by ArenaSweats, updated 5 Nov 2026.

Tips

Max Quantum Computing and use a lethality Energized item to help with recast speed.⁴
Level 3 Quantum Computing and Lightning Rod are the minimum for an autocast build to be decent.⁵
Level 3 Quantum Computing is not needed once the Energized synergy is in place.⁶
Level 3 Quantum Computing is the only way for an autocast build to go truly infinite.⁷

Interactions

Quantum Computing's multicast acts as an independent multiplier to the number of autocasts; at level 3, autocasts can multiply up to four times.⁸⁹

With max-level Divine Intervention and Quantum Computing, Divine Intervention does not proc more times from Quantum Computing. Healing above and below 50% health can trigger Divine Intervention repeatedly if it is also max level.¹⁰

Autocasts that count as ability damage can trigger Energized; Hexbolt Companion can then trigger autocasts again. Runecarver stacks Energized when those autocasts count as abilities, which can restart the loop.¹¹
Quantum Computing does not stack Energized with Runecarver; some newer autocasts, including Wildfire and Firefox, do.¹²
Only Slime Time, Firefox, And My Axe, and Wildfire autocasts trigger Runecarver; Quantum Computing is not required for the Energized loop.¹³

Quantum Computing is strong when the user is already unkillable.¹⁴

A tank or bruiser with crowd control is recommended for an autocast build with Quantum Computing.¹⁵
Hecarim is recommended for an autocast build with Quantum Computing because his area damage and frequent movement can generate and trigger Energized.¹⁶
Hexbolt Companion, Runecarver, Lightning Rod and level 3 Quantum Computing are recommended for frequent autocasts; an ability haste augment and other autocast augments can also be added.¹⁷
Level 3 Quantum Computing can replace one of the two spammable ability autocasts in an Energized build, or be added alongside them.¹⁸

Bugs

No verified information yet.

History

Earlier formats

Quantum's extra percent health damage helped more with killing than Circle of Death's healing.¹⁹ 8x2 duos

Sources

19 cited

1

League WikiLeague of Legends Wiki, Module:ArenaAugmentData/data, revision 4070515

Quote
Tier: Prismatic
2

League WikiLeague of Legends Wiki, Module:ArenaAugmentData/data, revision 4070515

Quote
Description: Automatically cast an improved version of Tactical Sweep, winding over 0.75 seconds to slash in a 650 radius around you. The slash deals physical damage to enemies within the area (12 seconds cooldown). Enemies hit by the outer edge of the circle take bonus physical damage equal to 10%
3

League WikiLeague of Legends Wiki, Module:ArenaAugmentData/data, revision 4070515

Quote
Per level: Level 1: 150+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow. Level 2: 225+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow. Level 3: 300+9*x (+ 85% bonus AD) (+ 50% AP) physical damage.slow.; Max-level effect: Your automatic effects have 25% / 10% / 1% chance to multi-cast.
4

PlayersPosted 6 Oct 2026Single source
5

PlayersPosted 29 Apr 2026Single source
6

PlayersPosted 22 Aug 2026Single source
7

PlayersPosted 19 Jul 2026Credible source
8

PlayersPosted 9 Sep 2026Single source
9

PlayersPosted 6 Oct 2026Credible source
10

PlayersPosted 21 May 2026Credible source
11

PlayersPosted 22 Aug 2026Credible source
12

PlayersPosted 6 Aug 2026Single source
13

PlayersPosted 6 Oct 2026Single source
14

PlayersPosted 19 Jul 2026Credible source
15

PlayersPosted 18 May 2026Single source
16

PlayersPosted 18 May 2026Single source
17

PlayersPosted 18 May 2026Single source
18

PlayersPosted 18 May 2026Credible source
19

PlayersPosted 27 May 2025Credible source

Something missing or wrong?

Tell us what this article should say and, if you can, where it's shown. Suggestions are reviewed before anything changes.