[ ]A Verdant Sapling, a self-regenerating model using almost no steel but instead the magical heartwood. Such a model will lose resistance and strength compared to the old frame, gain a slight increase in mobility, but most importantly will heal damage over time and endure almost indefinite exertion.
Tough choice. An new siege weapon that can defend itself could really ruin someone's day. And plus Mitsuko likes that option more and it rarely hurts to keep the NPCs happy. Nonetheless, with the Verdant Sapling, barely needing to repair Hope for the Harvest will be extremely useful. Damage puts it out of commission for less time, it can be out in the field longer, and it'll save us money. And being able to recover from infantry-scale damage through the course of a battle, considering that a Falling Mountain is made for taking on large amounts of infantry, will be really good.