At
THIS thread i found out bugged item.
Its called "Banner of the Horde" . I think that if u use it u dont receive exp for won battles. It would be nice if someone else tried it too to reproduce this bug.
I cant be sure but it might have to do something with "Diplomacy" perk.
http://i.imgur.com/Z28Ja.jpg?1
"Onslaught" perk seems bugged also because it should give 10/20/30 adrenaline to random orc unit at battle start but every fight i do always 1st unit gets boost.
In my party (screen above) its Blood Shamans.