@Blueberryfun
I had mage and paladin
Tips: Do not attack the girl, if she gets killed the giant gets enraged and does bonus damage
Focus on the giant and keep the paladin alive using heal and potions. The priority is to keep paladin alive since he can revive the mage but the mage can't revive the paladin. Keep paladin's health above 75%. Mage: use lightning bolt and life drain on giant (use special on giant). Paladin: focus on healing himself and mage. If health is full, attack the giant with holy strike. After giant is dead, the girl will be easy!
That was the longest fight so good luck! Remember to use wisdom aura in the beginning.
PRO TIP: Birdman Tribe LEader is the best unit. With his flying abilities he can travel fast and with his staff attack he hits 8's very quickly. I killed the final boss in literally 2 seconds with its staff attack :D