Hi,
now I have the right data about my Talisman of the North (Level 5) :
Skills: Wisdom + 2 & Hide in Shadows + 1
Other stats : Indom. Will : + 1 & Magic Dam + 2 & 3 empty Enchantm. Slots
I'm thinking:
could it be 
the 2 stats (I.W. & Magic Dam)
depends on the current hero's "stats" ?
So I know my Intelligence was for sure higher than my Strength when I take the Talisman with me. So maybe the dev's of Larian make it SO that in "most of the situations" the items your hero(ďn) find come his/her way more ADAPTED to his/her build ?