Decreases 5 levels of penalty for your A, S and S+ grade equipment for 24 hours.

A-grade items from level 56 instead of 61.
S-grade items from level 71 instead of 76.
S80-grade items from level 75 instead of 80.
S84-grade items from level 77 instead of 82.

The remaining period decreases even when you exit the game.

This Rune don't working on Olympiad.