Bonus

Rune Speed

Rune Speed is a confirmed bonus target from joining the group and liking the game.

The official game description lists Group + Like as a +10% Rune Speed bonus.

Rune Speed should matter most when Rune rolling or Rune leveling becomes part of your main route.

Because exact Rune timing is not verified here yet, the wiki tracks the bonus but does not invent a formula.