I played through the Haven campaign with a Warrior hero on "easy" difficulty. Essentially, the development of all Warrior heroes differs only in minor details – for example, for Anton, it's better to take leadership and "heroism" to gain the faction skill faster. "Counterstrike," "cleave," and, of course, "tactics" will also be useful. "Reinforcement" for the guards will be very helpful (preferably level three, as the effectiveness increases). I developed him in Tears, as the skills are clearly more useful there. As a complement to the "Martyr" effect, you can take "endurance." "Healing" won't be superfluous either.