I want a giant mechanical semi-automaton that takes a dozen-car steam train and turns it into an explosive flail weapon. The machine itself should have a working scale model of the Stonehearth solar system operating inside its chest, with the hearthling commanding the behemoth suspended within the sun of the model while symbols of arcane lore orbit around him or her.
And what the heck–throw in a shoulder-mounted wombat projectile system with homing capabilities while we’re at it.
(By the way, you’ll need to make a train first.)