"Item Name": Particle City Defense Shield.
"Item Level": Four-Star Item.
"Item Effect": It can absorb cosmic rays, particles, etc., from the universe as an energy source, raising an energy shield large enough to cover an entire city, possessing extremely strong defensive power.
"Item Restriction": The energy shield, when exposed in outer space, has the most robust effect. If placed on a city on the planet's surface, the absorption of cosmic rays and particles may be slower, and the defense effect may also be reduced.
"Item Introduction": I have a city that can withstand thousands of soldiers and horses!
This item can be said to be extremely suitable for Thousand Star City.
Not that suitable in other places.
Because Thousand Star City happens to be a city exposed in outer space, not on any planet's surface, but built in space.
It is located at the edge of the federation's territory.
Without much hesitation.