Need hints & advices concerning summoning...

[Saulot]

No, not irritating, heh. If they were, I wouldn't bother writing a response. Just very difficult to answer.

I should re-emphasize and rephrase that list piece of advice I gave, to just look at the spell list in the game (click on each one and read the description) and with the manual open to check out the stats of various summon units, and to examine each spell individually. Spending an hour doing that will give you a much better idea of what's available, and probably save dozens of hours of just random experimentation.

If you want strategy examples that are different or more advanced from what the manual offers, I suggest the strategy index. (On the off chance you haven't already examined it) Reading about what other people do with a nation, or suggest doing with it, can be very helpful in directing you to points of interest that you would want to examine and experiment with.