What does Rune Master medal actually do?

[tiberiu]

It says Rune usage bonus +10% but what does that actually mean?

The requirement is unclear too : "rune most often used in the first ten rounds of combat".

If somebody can clarify this please do so.

[Nevar]

The requirement is to use up runes in combat. That's it. Very easy.

The effect, I'm assuming, is to increase the effect of runes in combat. I have no idea, however, if the +10% means Attack Runes now give +30% or +22% instead of the normal 20%.

I'm guessing on the effect, though.