I'm working on a different plugin to add in some special reward items that would spawn in radiant quests
Current ideas
All of this is very very early pass concepts and will likely not be actually "craftable" by a player only found by engaging in the combat caravan quests.

Ancient Statue Works like the psychic emitter just on a smaller scale and no power consumption

Ancient Oni Bed
An Ancient Oni Bed built in tune with the natural energies. boosts the healing rate and aids in medical care. And still provides a comfortable sleeping arrangement.
cost Wood (80) Steel (25) jade(50) 15hp health gain per day over base beds 10, does not stop bleeding. immunity gain 1.09 medical tend boost 0.10

Ancient Zabuton
A large, soft, comfy seat. Great for relaxation. It can be used at tables, work stations, and elsewhere.
cost 210 material Comfort increased by .5 over armchair base beauty 5

Ancient Eternal Torch
An Ancient torch lamp for lighting an area. People need light to move and work at full speed. It does not need to be refueled. Produces a small amount of heat.

requires uranium(20) Plasteel(80) Wood(10)
Ancient Oni Grow Orb
An Orb crafted by the Ancient Oni which lights an area brightly enough to grow crops. Automatically turns itself off at night.
requires uranium(50) Plasteel(140)

Xiangqi Shogi table
A large table designed with realistic terrain including a river, mud, sand, grass, and hills. The game is between two armies and has complex rules for every tile game that is played over days or weeks with the time taken between turns to plan. It trains intellectual ability.

Joy source Cerebral size of a billiards table. The increased stuff cost 120. base beauty 12 joy gain 1.8
cannot be blocked on sides

Ancient Oni Kofun
A large ornamented burial receptacle for the honored dead.
Sarcophagus alternative - larger size double cost-increase based beauty by 25

Ancient Passive Cooler
A traditional unpowered cooler that works by Heat exchange using Uranium. It does not need to be regularly replenished. It is designed in such a way as to push a room to a comfortable temperature of 21c.

Pushes room temp down to 21
requires uranium(25), gold(25), jade(25), and wood(50) to build

Ancient Passive Heater
pushes room temp up to 21
requires uranium(25), gold(25), jade(25), and wood(50) to build