Going over crit cap in ARAM Mayhem usually means the extra critical strike chance stops giving you more benefit, so you waste stats past the cap rather than getting stronger. In practice, that means you should try to spend those points on other damage or survivability stats instead.

What it means

Crit cap is the point where your crit chance can’t keep improving the relevant effect anymore, so anything above that threshold has no value for that mechanic. For crit-focused augments or builds, the game may still show the extra crit chance, but the payoff is already maxed out.

In ARAM Mayhem

The most important part is that some ARAM Mayhem augments scale off crit chance, and one documented example scales bonus critical strike damage up to 50% of your critical strike chance. That means once you are past the cap for that effect, extra crit chance generally does nothing for the capped scaling and is effectively lost value.

Practical takeaway

  • If your build is already at or near the cap, don’t keep stacking crit blindly.
  • Shift into penetration, raw AD, on-hit, attack speed, or defensive stats depending on your champ.
  • If a specific augment says it scales with crit, check whether it has a cap or soft cap, because that determines whether overcapping is wasted.

TL;DR

Over crit cap in ARAM Mayhem is usually just wasted stat value, not a hidden bonus. The exact impact depends on the augment, but for capped crit-scaling effects, extra crit chance beyond the limit gives no additional payoff.