So once you start playing Olberic, you have to first spar with some villagers, then fight some bandits. Once you fight off the bandits you need to head to a cave, where you will find and fight the Bandit Leader, he can be tough, honestly don't know what happens if you start the game off as Olberic, but I when I fought him my guys were like level 8 or 9, and he can call in reinforcements and his special attack was a one tap kill for all my guys, I would say focus on the Boss because he will do his special more often if you remove his troops, stock up on a ton of heals and revives for this fight especially if you have more than one person on your team