When Arnâron was still pleasant and inhabitable, its inhabitants built an advanced technological civilization. They lost most of that technology since the cataclysm occurred that sent Arnâron into a slow, creeping downward spiral of death. But not everything was lost; like Arnâron itself, civilization and technical knowledge seem to fade slowly and not suddenly.
The people retained a good knowledge of architecture, and while they lack advanced construction machinery, they have an intimate knowledge of building sturdy, protective buildings. Their buildings, while not fancy by modern Earth standards, are well-built and able to endure centuries. The capability to build new large-scale canals has been lost for a long time.
Personal armor is limited to reinforced leather armor. While metal armor like chain mail could be made, it is exceedingly uncomfortable to wear metal armor in the climate of Arnâron. In addition, the availability of guns makes rigid metal armor rather useless, and warriors instead rely on surprise, speed and maneuverability.
Due to its state of constant warfare, weapons manufacture is one the most advanced technologies on Arnâron. The people of Arnâron know how to make extremely durable steel, and from this they fashion swords and other metal weapons of the finest quality. Guns are the most important weapon; highly accurate pistols and rifles are available but the required precision makes them very expensive. As guns need ammunition, which may be in short supply in many locations, soldiers always carry melee weapons in addition to firearms. Cannons are the most powerful weapon in the arsenal of the various armies, and are often employed in sieges. Powerful pieces of indirect fire artillery are the strategic weapons of Arnâron.
Personal transportation is strictly on foot or, for those who can afford it, by riding a mount. They are expensive but fairly commonplace, every middle class citizen should be able to afford one if he so desires. Long distance travel is done in caravans, which are organized between many cities. The other available transport for long distance travel are canal barges and sailing ships. Naturally, these can only travel along the canals, rivers, and on the remaining seas.
Agriculture is, by necessity, efficient and productive. Crops are rotated, irrigation systems built, dung and excrements are used as fertilizer. Most nations make a point of burying their dead as well, for the same purpose.
Medicine remains fairly advanced – even when most other technologies regressed to more medieval levels, there are some things not forgotten; germ theory, antibiotics, and so on. Most of the nations can still perform quite complicated surgery – you’ll be out of luck if you require brain surgery or a pace maker, but Mid-20th Century level surgery isn’t generally a problem.
Power generation is based on muscle power (slaves and animals) as well as water and wind power. Steam engines are known, but many areas do not have anything they could burn for fuel – coal mines are few and far between, and inedible wood is much more valuable for construction or for the manufacture of items and weapons. Solar power is used in many areas to heat water, but solar cells can no longer be manufactured. Electricity is known and used in the most advanced cities, mostly for illumination.
Astronomy is fairly advanced, while a lot of details were lost over the centuries, the basic layout of the universe is known – that the planet circles around the sun, what the galaxy is like, what stars are, and so on. Astronomy is a science for the rich nobility, who possess some very powerful telescopes for this purpose. The thinner air, and lack of light pollution, makes Astronomy from Arnâron’s surface easier than from that of Earth. Astronomy often has a dual purpose, as astronomers are also astrologers and try to divine the will of the gods and the destiny of various people from the stars.
Generally, manufacture is at about a 19th Century level – with small factories and workshops rather than mass production. Machines used in the factories are unsafe, loud, and noisy.
Communication over long distances is conducted by messenger and heliograph and similar optic communication (signal fires, signal flags, and so on).
A good deal of technology that was once forgotten is still known to be possible. In some cases, the only thing that prevents it from being used is lack of resources and tools; in other cases the basic idea is remembered, but it seems like magic. As a general guideline, everything to mid to late 20th Century technology will be known in some or great detail to a historian or engineer, while all “futuristic” technologies are firmly in the realm of myth and legends.