I'm actually a fan of having it a maze-maker structure but unfortunately it doesn't mention anything with the giant sized proportions of Lorath and Leng's mazes.
The Great Empire of the Dawn also used black stone and far more prolifically, such as for the Five Forts. Maybe the base of the Hightower was built by that Empire or craftsmen of it? Maybe the Dawn Empire was far larger than we thought and it had connections as far as Westeros? We don't have any evidence for the Deep Ones being able to build in black stone apart from at the Hightower, and maybe the Hightower actually has no connection to the Deep Ones at all?
We don't have any evidence for the Deep Ones being able to build in black stone apart from at the Hightower
As the Deep Ones are established to be fictional and/or a rationalisation of sailors in the Dawn Age, we should consider the mazemakers of Lorath as the most likeliest origin. I am thinking Azulujo's tunnel designs and the tunnel patterns under the Red Keep are the way forward
In all situations the Deep Ones are never confirmed to answer prayers or appear. Heck the Deep Ones could be the krakens or leviathans of the Shivering Sea, who soldiers pray to for a smooth krakenless journey*RELEASE THE KRAHKEN*
Leng's history goes back almost as far as that of Yi Ti itself, but little and less of it is known west of the Jade Straits. There are queer ruins in the depths of the island's jungle: massive buildings, long fallen, and so overgrown that rubble remains above the surface...but underground, we are told, endless labyrinths of tunnels lead to vast chambers, and carved steps descend hundreds of feet into the earth. No man can say who might have built these cities, or when. They remain perhaps the only remnant of some vanished people.
Oldtown has a climate similar to the Mediterranean, experiencing warm to hot summers and mild winters. We opted for a plains biome rather than mushroom island in order to set it apart from the Westerlands. With similar and at times even the same inspiration and references as the Westerlands, keeping both regions unique has been one of our main challenges. If people think this is an error, we're open to discuss it.What is the climate and vegetation of Oldtown and its area? As far as I know it was stayed that it was somewhat mediterranean, but the area, at the same time, uses plains biome instead of mushroom island (not that this excludes the possibility of been Mediterranean). Any iconic trees or plants to the city scape or the forests at the outskirts of the town? What would be an equivalent in real life in terms of climate or vegetation?