Since we’re in a medieval / magical world on the brink of steampunk, and we’re already fighting Ogres, I thought it might be interesting if our Engineers could use their gears to make a similar tank. To make these a little harder, you could even make it so that a Level 6 Mason has to craft the “Heart of Stone” to give him life.
This golem could then either be used just like a fighter and have commands to be able to be issued, or be like a turret and is tethered to an area they must defend.
Be good guards at the doors of the castle too.