KillAndAction - KonServator
KillAndAction (Haven, Letos) lose to KonServator (Haven, Gilraen)
KonServator (Dwarves, Karli) def. KillAndAction (Dwarves, Helmar)
KillAndAction (Barbarians, Krag) lose to KonServator (Humans, Dugal)
1) I went with a pure warrior build because there was nothing worthwhile in the Haven faction, and at level 15, I only got 2 spells. In battle, the resistance triggered a couple of times, so I defeated the Haven troops without much trouble.
2) Soldier's Luck, the Stun rune, and mass acceleration, combined with leadership, were very effective, practically preventing the opponent's troops from moving.
3) I got an education, which gave me a stat advantage, plus it helped with subduing with mass debuffs.