Skill Runes:
There are 9 Skill Runes in the game which increase Bilbo's attack ability making him a more effective fighter.

Strength Rune:
Increases Bilbo's strength enabling him to carry more stackable items like his food capacity which goes up from 30 to 50.

Jump Rune:
Increases the distance Bilbo can jump which will enable you to jump again in mid-air.