ToME: the Tales of Maj'Eyal

I don't know if this a bug or a typo.

In the description of "Born into maic" talent on (talent sheet) it is written : "you gain a 20% bonus to the damage type for 5 turns".
But when the bonus is indeed triggered, the bonus tooltip shows : "xxx damage increased by 15%"

So, which is true ? 15 or 20% ? The value should be the same on all descriptions.

And thank you for this great game !

The bonus is 15% as far as I can see. Keeping this value in one place and using it for different descriptions can make changes easier. For example, to update descriptions to a new value you only have to change it once, instead of changing it in every description. I assume devs had their reasons to implement it the way it is currently.