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Still, I replayed it. Plus, I gave up on the useless super-ability and chose the following for the first mission:
- luck with trophies (I got a lot of resources);
- pillaging;
- leadership with a speed aura;
- attack with retribution and cold steel;
- chaos magic for cold steel and storm lord (although, it wasn't useful in the first campaign).
Furies with a "speed aura" and boots that grant +1 movement, along with luck and high morale, simply tore through everyone. The bow and quiver greatly enhanced the assassins.