Skills: Attack, Defense, and Diplomacy
http://mmh7.ubi.com/en/blog/post/vie...ense-diplomacy
However, diplomatic abilities, as usual, are ambiguous. Let's see what happens in the end, but for now, I'm afraid that diplomacy will be a terrible imbalance in some missions and an absolutely useless thing in others. As usual, though. It would be worth implementing diplomacy a-la Markel from H5 (and a-la H4): guaranteed (or with a good probability) joining, but only a small part of the unit.