[New rune has been gained: Stealth-I.]
[Stealth-I: Hide the target from creatures with less than 100 points in perception. The effect decreases the more perception someone has over a 100.]
Arthur gained this rune after he killed the undead knight, which was a high-tier monster, by himself. It had a long explanation, but its effects were simple with clear limits.
If someone had less than 100 points in perception, they wouldn't be able to see Arthur. If someone has over 100 points, then the effects start wearing off the higher their perception is.
This would help Arthur if he ever needed to avoid the nuisance of being spotted by both humans and monsters. Of course, for someone with Si's perception, there would be no effect at all. However, this rune was still at its lowest tier. He could work to evolve it further.