At some point during book four, the party was sent to Taldor to establish trade relations with a major regional nation. While there, they were tasked with designing warships.
The rivers large enough to handle shipping were beginning to see use by the PC's kingdom and the group wished to protect those interest. Also, they wished to have ocean going vessels based out of Taldor.
A plan was hatched to commission a new single decked warship that could hold half the normal crew, but still navigate the shallow rivers. These had to be built to specifications. While the PC's waited, they looked for means to arm their warship and managed to learn about Cannons.
One of the PC's is full level caster. The Baron, requested for his new new warship to be enchanted for flight and Invisibility.
So, a flying warship with cannon and cloaking. How much trouble am I in with this?
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The Baron, requested for his new new warship to be enchanted for flight and Invisibility.
So, a flying warship with cannon and cloaking. How much trouble am I in with this?
This is essentially the creation of a magical item and would fall under those rules.
If you have not yet given them the go ahead, you want to start your comparison pricing for how much it will cost them to make this. If you are at a stage in Kingmaker where the ruler is still a "Baron", then there is no way they should be able to afford the cost of creating such an item.
Benchmark against other items-example- To create a flying carpet:
Craft Wondrous Item, overland flight; Cost 10,000 gp (5 ft. by 5 ft.), 17,500 gp (5 ft. by 10 ft.), 30,000 gp (10 ft. by 10 ft.)
So, it costs 30,000 gold to make a big carpet fly.... it would take hundreds of thousands, perhaps millions of gold, to create a a small ship to be made flying. That doesn't even touch on making it invisible.
If your PCs do have a million gold or so to build this item with, it's not that big of a deal for your campaign. Chances are that other Barons and nations also have the resources to make these. I would point this out before them make their first ship.
If this somehow happened in my game- Having important NPCs fall off the deck they cannot see would be my warning shot. I would also consider attempts to steal it.
Early on, I would also point out how thrown flour can coat a person. A light snow or rain would make the invisibility worthless, and depending upon the season and altitude there might be enough precipitation to keep the ship visible.
Then I would have a a territorial dragon rip it to shreds.
Note: Currently we have a "Duke" and are in the 4th book. There is no way my PC's would be able to afford this. They also know how much I love Numeria and would love an excuse to bring more of it into the campaign- "Nice Bird of Prey. Did you know that the one the bad-guys have is for real? Well, theirs can fire while cloaked and also has awesome sensors!".
A Bird of Prey cannae fire when cloaked!
I would use the craft misc magic item feat to magically treat the boat for additional hardness and hit points and have a player or caster treat the boat with the Hardening spell.
Casting book ward on the sails before letting it set sail is also a probably good idea.
If you can make cannons then you can make bombs, and bombs kick ass against boats because they ignore the hardness of wood and stone.