Oh god, oh fuck, we fucked up, when you regularly deliver superweapons, soon people expect you to do that on demand.
I mean...
I think that we kind of
can deliver superweapons on demand.
For example, Purple Sun is a terrible defensive weapon. It's indiscriminate, its area is too large, and there's no way to defend your own troops from it. It's a terrifying
offensive spell. Outfit a high-performance gyrocopter with stealth gear, then replace its standard payload with an item that casts Purple Sun. Just buzz around the enemy army or fortification eradicating bits of their civilization. It's the equivalent of a nuclear bomber, except nobody's yet invented the ICBM, radar, surface-to-air missiles, or even interceptors.
Substance of Shadow to dive straight from the surface into the Underways. Since we own the surface and can travel
much faster aboveground, this amounts to letting us to spawn armies at arbitrary locations underground. Combine with the Teleportation Tower we were thinking of earlier and we can be literally anywhere in K8P, even underground and behind enemy lines, in seconds. edit: Combine with a way for Mathilde to broadcast her position, probably simultaneous castings of Locate Item from different points to triangulate and get her position and depth, and we'd be able to consistently drop massively-runed longbeard hit squads on enemy command posts.
A network of minor items that cast
Sounds, which acts in line of sight, to replace the sharply bandwidth-limited signal flags with magical telephones. Bonus points if items are embedded in the walls and floors throughout the region, letting us listen in on any enemy forces that enter the area.
Just stack up every reroll/precision buff into a single item, then dump the wombo-combo on high-value low-probability precision actions like "Mount a runed ballista on top of Karag Lhune and snipe the orc warboss from across the caldera". Premonition, First Portent of Amul, Omen, Lens on the Sky, Eyes of Truth, Enchant Item, Trial and Error, Law of Logic, etc. I think that's three rerolls, two "will trying it now be a good or bad idea", two supernatural performance bonuses...
That's half an hour for me to brainstorm and research four-ish ideas that are approximately one tweak away from qualifying as superweapons. Probably not difficult for the thread to flesh out more.