How exactly does "defeated"-bonus work in Mythology checks?

[MikeB]

I just did my second Mycora fight and expected to get a "defeated"-bonus when investigating their stats. To my surprise, the bonus was still zero. After killing 3 of them in the first fight I would have expected something higher than that. In the third fight a finally got a bonus of 1.

So I wonder how this "defeated"-bonus is calculated exactly. Is there a certain threshold of enemies of the same type you have to kill before receiving it? If so, does the bonus increase further with higher number of kills?

 

[DavidBVal]

it is per-fight, not per-enemy, and different types of enemies require more or less fights to increase. Typically more rare creatures immediately grant a +1, more frequent ones grant 0.3 to 0.5

yeah, I know, should be written somewhere...