There seems to be some new Hero Attributes in Evony Age II. That is hero leadership, hero speed and hero energy. Hero energy seems to be a certain number out of 100. Every time your hero marches he looses 4 of his energy points. These energy points will recover over time.
The speed attribute speeds up your travel time, it does so by dividing the normal travel time by 1+0.1*MountLevel, ie if it normally takes 140 seconds to get somewhere and you have mount level 4 then it will be divided by 1.4 giving 100 seconds.
Not sure about leadership, I read on the forums that each level allows you to command 1000 troops effectively and that if you send more out than this the hero can support then their are increased losses. I don’t think it increases losses directly, I think it reduces the effectiveness of the extra troops so they might only be fighting at half their capacity or something, ie if you send 100k archers with a 60 leadership hero, I suspect 60k will be at full attack and the remaining 40 will attack at a reduced level which if I had to guess would be half.
You definitely seem to get a lot more losses attacking NPCs with a low leaderships level, I go around 40k losses with one around 60 that in age 1 I’d have expected only around 20k losses with, I’m attacking with 90+ leadership now and getting losses similar to what I would expect