The weaponry developed on the Warworld of Maia
Codex for the Maian Submissions, so they can be seen in order.
The Warworld of Maia has created a number of wondrous weapons.
Maia... it was supposed to be Earth's sister planet, but instead, Project Infinity delivered us to a world that knows only war.
To Infinity, and Beyond
motto of Project Infinity
After the PCs defeat (or force the rapid retreat of) a villanous necromancer/demon summoner, they discover a book. This book outlines how to summon a demon whose power increases according to the size of the summoning circle used to summon it. And after the PCs examine a map of the country, they find that the layout of the cities and roads match up with the required summoning circle. In fact, the final road that would complete the circle is currently in construction.
With anyone who can find out about the circle and the ritual to summon the demon able to somehow make the final road/line, and destruction of the cities and roads currently in existence out of the question (unless this is an evil campaign- that removes the moral quandary), how are the PCs going to solve this problem?