This infinite mana and damage bug ruined ranked

League of Legends ranked matches faced unprecedented disruption from an unlikely source—the shop’s undo functionality. This seemingly innocent quality-of-life feature became the gateway to one of the most game-breaking exploits in recent memory.

Unlike typical bugs that require specific champion interactions or rare conditions, this vulnerability affected every champion universally. The exploit’s simplicity made it particularly dangerous, as players didn’t need complex technical knowledge to execute it. What made this situation especially concerning was how it bypassed traditional balance checks and could be activated during any phase of a match.

The mechanics behind this exploit reveal fascinating insights into League’s underlying code structure. Players discovered that having Biscuits of Everlasting Will in their inventory created an unintended loop when combined with the shop’s undo feature.

Here’s the step-by-step process that created infinite scaling:

1. Acquire Biscuit Delivery rune from Inspiration tree during champion select
2. Receive Biscuits of Everlasting Will as the game progresses
3. Visit shop and sell the biscuit item
4. Immediately use the undo button to reverse the sale
5. Repeat process rapidly to stack maximum mana indefinitely

The critical flaw occurred because the game’s code treated the sale undo action as if the champion had consumed the biscuit. Each iteration permanently increased the player’s maximum mana pool, creating exponential growth potential.

This became particularly devastating when paired with Muramana, which converts maximum mana into bonus attack damage. Champions could achieve thousands of bonus AD within minutes, completely breaking game balance.

The competitive integrity of ranked matches suffered immediately as players discovered and shared this exploit. Unlike our Weapons Unlock guides that focus on legitimate progression, this bug created an unfair advantage that couldn’t be countered through skill alone.

Content creators like Vandiril documented the exploit’s devastating effects, showing champions reaching absurd power levels that made games unwinnable for opponents. The ranked ladder became a testing ground for who could abuse the bug most effectively rather than who played better.

Riot Games initially addressed the issue in Patch 13.6, with patch notes claiming resolution. However, the community quickly discovered the fix was incomplete—the exploit remained fully functional despite official claims to the contrary.

Faced with the persistent exploit, Riot implemented emergency measures by completely disabling the Biscuit Delivery rune across all game modes. This nuclear option prevented further abuse but also removed a legitimate strategic option for players who relied on the rune for laning sustainability.

The temporary disablement reflects the complexity of fixing underlying code interactions without creating new vulnerabilities. Similar to how our Complete Guide addresses balanced gameplay, developers must now reconcile quality-of-life features with exploit prevention.

This incident highlights the ongoing challenge in maintaining game integrity while preserving player-friendly features. The undo button, designed to prevent accidental purchases, ironically became the source of one of League’s most disruptive bugs.

Looking forward, this experience may influence how Riot approaches similar mechanics in future updates. The delicate balance between accessibility and exploit prevention becomes increasingly important as the game’s complexity grows.

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