Saxon: Both of your heroes are a bit overpowered for level zeros. Drop one skill from Boris and he should be fine. As for the wurm, you can leave it as is and I'll trust you not to powergame the tooth strength listed in his Devour skill. I figure it won't matter since he'd swallow most victims whole anyway. Other than that, drop the cannons from the zepplins unless you have each cannon take up its own level 0 slot or higher.