Decreases 5 levels of penalty for all of your equipment grade for 24 hours.

S-grade items will be available starting from 71 level, instead of 76.
S80-grade items will be available starting from 75 level, instead of 80.
S84-grade items will be available starting from 77 level, instead of 82.

The remaining period decreases even when you exit the game.

This Rune don't working on Olympiad.