I have been tossing around a few ideas and have come up with the following can anyone broaden the list ?
Magic items to assist kingdom building (leader) caster or (leader) user must spend 1 week of the month assisting the building not ruling or adventuring
Maximum assist -2bp to the cost or +1bp to the income
Ring of elemental command (earth): -2bp buildings
Helm of underwater action ( only water adjacent buildings ): -1bp buildings
Rod of Metal and Mineral Detection: a further +2 economy per month to the mine(from river kingdoms book).
Staff of earth and Stone: -1bp buildings
Mattock of the titans: -1bp buildings and mines
Orb of storms: +1bp income from farms in the same hex
Lyre of building: -2bp to cost
Gloves of Shaping: -1bp buildings
Spells to assist kingdom building ( a wand will use 5 charges to facilitate the same effect)
Stone shape: –1bp cost
Wood shape: -1bp
Wall of stone: – 2bp
Fabricate: -2bp
Plant growth: +1 bp income from farm hex ( once per 3 months per hex)
Move earth: -1bp for land preparation for hexes and cities.
That looks fairly solid. Good one!
I might relax the one week requirement if they have access to teleport or other quick travel spells.
My players wanted to get permanent Teleport Circles up.
It's a ninth level spell.
I did price out once/day teleport mirrors for a player who wanted to set up a comm network, and they were a lot more affordable. (once/day, discounts for only teleport to one of the other mirrors and for fixed location,it came out to about 10-15K gp)
Finding a level 17 level caster might be hard.