Beast Tide
Sam as usual went ahead with the investigation.
Everything about this city is very different. Unlike the other cities, this one didn't have a definite shape of a circle, ellipse or a square. Instead it is very uneven.
The city walls are not constructed out of some special earthen stones that are massive. Instead, a large number of trees are grown in a pattern around the city and each tree has a fixed distance. Between these trees as nodes, they built a wooden wall of decent size.
Of course, this wooden wall and the formation of the trees gave them adequate defense against the beasts.
Sam is really impressed by how much they kept the nature intact.
But that gives him a lot of trouble when the disaster strikes.
In the second disaster, at the ruby city, the lava has been flowing beneath city through small currents. That already gave him a lot of trouble. He has to design the external defense as well as the internal defense.