Big Brain: LoL Arena Augment | ArenaSweats Wiki

Big Brain is a gold augment in League of Legends Arena.

Overview

At the start of the combat phase in each round, gain a shield that absorbs damage equal to a multiple of your AP and lasts until destroyed.²

Level	Effect
1	300% AP shield.
2	400% AP shield.Max-level effect: Refresh the shield after 3 seconds out of combat.

Out-of-Combat Timer changed to 5s in patch 26.21 (was 3s)⁴

2026 Season 3 Act 2, all regions

AArenaSweats tierA tier

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

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At max level, Big Brain’s shield refreshes after 5 seconds out of combat, changed from 3 seconds in patch 26.21.⁴

Riot patch notes that name Big Brain, newest first

Patch	Date	Changes
26.21	20 Oct 2026	Out-of-Combat Timer: 3s ⇒ 5s⁴

Patch 14.14 fixed a bug that let Master of Duality increase Big Brain’s shield during the preparation phase.⁵ 8x2 duos
Big Brain could check AP during loading before a round, allowing Master of Duality stacks gained by attacking the target dummy to increase its shield; whether this interaction was fixed was uncertain.⁶ 8x2 duos
Big Brain could benefit from a 25% slow resistance or tenacity while its shield was active.⁷ 8x2 duos

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