[twillight]

Ok,that thing about rodplanting was a misunderstanding, forget it.

Also a correction on unit-levelling: they loose the exp only if on the named map it is possible for them to evolve further, AND you didn't forced them to remain as they are (there is a special button for that on the team-management screen).

The "you have capital" system leads to a strange way of playing, and a cheat for the AI.
First: you can not destroy capitals, what mean on the middle of your territory will be an enemyspawning building, and they especially like to rod your manasources.
Second the solution: Put lvl1 heroes with lvl1 units all around the enemy capital. The bad news is, the AI cheats, and can create lvl2 units in town. Still, this is a pretty safe way to close them in. This tactic can be advanced the way I won the last battle of the first mission of the Empire Saga.,

what is: bleed them out! The enemy you supposed to conquer is just too strong for any of your team? Send there suicide ones! At the end of each scenario you can keep only 1 hero (and 5 items, each potion counts as one, so no possibility for cheating here, but you get some free healing + resurrection potion at the start), so the rest can be sacrifised for "the greater good".
So if you want to be sure you enclosed a capital, put there 2-3 basic hero in a row, and that's it.

Speaking about resurrection: if you carry the dead unit on your hero to a city (and you have the building), you can resurrect that unit. Or just use a resurrection-potion. Resurrection means the unit will be aive with 1 HP (so heal him too).
I don't have experience with summonings.

Going back to cities is only required for healing (hence the adventage for warrior Lord whose units on field also regenerates). Units with enough exp transform automatically, and spells you get also automatically.

Remember you have objective! Reaching THAT ends the scenario.
Before ending a scenario try to collect all items you want, and reach the level you feel! For the first map of Empire's Saga I suggest level 3.

Leveling happens only the NEXT DAY. Only then you'll be able to choose a special ability. If you reach next level when scenario ends, you'll get your levelup right at beggining of next mission.

Spells won't be carried over!

Rodplanting heroes: they can have 1 unit carried, but that's a joke. Use these on 1) mines far away 2) islands, because "influence" don't spread accross mass water 3) for delaying enemy rodplanters stealing your mine.

Thief heroes: infiltration is only temporary, and means you can see what party enemy player has.
They can not do regular shoping (so no selling things), but can steal any thing for sale.
Their prime use is "poison party" what means "X damage for entire party".
Duel can be also fun, but don't try that on stronger opponents.

All in all: nice game it is, only little strange.