Tactics for playing as the Sylvan faction.

I remember playing as a lieutenant against Zehir, with Ilfina. By the end, Zehir had accumulated 61 knowledge points (+60% to initiative and everything else), while my stats fluctuated around 30-40. I decided to try a non-standard tactic:
I upgraded the hero with:
1) Education with a skill that enhances the avenger
2) Luck with elven luck, of course
3) Logistics with keen mind
4) Defense with evasion and something else
5) Summoning magic with misty veil
I equipped the hero with the lion set.
In the end, it turned out to be very good. The hero moved very quickly thanks to keen mind and empathy, cast phantom on unicorns, which first wiped out the entire stack of rakshasa against the opponent, then 2/3 of the titans. Then another phantom, and the opponent surrendered.
If you can find the dwarf set for this, it will be even better.
If fighting against necromancers, you definitely need to upgrade defense everywhere possible before the battle, and take light magic instead of summoning.