How Exactly Does Courage Work

I know that it ups damage the more times you use it or something, but is there a timeframe you have to do it in since the last courage, is it for melee or spell? stuff like that, a full guide of what it does would be wonderful

 

Courage? It's just a flat damage boost for x amount of time, affecting everything.

 

so it applies to both melee and spell? also doesnt it stack or something? or did I just hear a false rumor lol

 

Idk how it would stack, but it affects everything, and that's why it's so overpowered

 

it doesn't stack
but it is a very powerful damage boost for a few seconds with an AoE of fire damage when you activate it