Can someone please explain the combat runes

[jake21]

In this game there is something called combat runes (I think that is the right name). It is mentioned in the first page of the manual but then for reason I do not understand they never explain their usage in combat.

Basically when you select a troup to move - there are three buttons (attack, defense and luck) but what the manual does not explain is what they do and more important what resource they use - what determines which options are available. Even worse they are called runes but are NOT the same as 'talent' (red, green, blue) runes which are used to gain skills.

Very confusing. I really wish they had described them in the manual rather than give them a single bullet point as a 'new' thing and leave it at that.