Technology
The Dark Mod takes place in a steampunk universe. For more information on Steampunk:
For the purposes of TDM, steampunk means that steam power has been discovered much earlier than in our own history. It allows devices that would normally be anachronistic for a late medieval society.
Many things that seem to be more advanced technology are possible with the use of magic.
The technology of the TDM setting ranges from late medieval to early Victorian, often side by side. Generally speaking, the more modern the technology, the more expensive it is and the less likely it is to be in common use (which is why things like large-scale rail systems do not exist).
Appearance
The more modern the technology is, the more effort should be put into making it look 'old fashioned'. While the steambots of the Inventor's Guild are obviously sophisticated robots, by making them appear to be made of old fashioned gears, boilers and clockwork machinery, it allows them to fit into the steampunk setting. A robot the *looked* sophisticated--highly polished, no obvious working parts--would not. A normal gage might look too modern, but if it used an old-fashioned clock-hand for a needle and roman numerals, suddenly it seems to fit the setting. That said, here are some tips:
Switches
Don't use modern looking buttons or small modern light-switches, but instead try hand levers or hanging ropes that turn things on and off.
Glass
Rather than large sheets of crystal-clear glass, use small pieces of glass held together by wires. Make the glass cloudy, murky, or otherwise imperfect.
Electrical Devices
Add prominent metal spikes (antenna). Make the object larger than it might otherwise be, to hold the mysterious working parts inside. Using brass for important metal parts is effective. Avoid blinking, coloured lights.
Steamworks
Steam technology has been around for some time, and there are many steam-powered inventions in use. Paddle-boats running on steam engines cruise up and down the river alongside traditional sailing ships. Houses of the wealthy are heated with steam boilers and steam-powered generators. Just about everything with moving parts in the city is powered by steam.
Clockwork
Clockwork machines are also fairly common...large clocktowers and grandfather clocks are expensive, but not unusual. Smaller clockwork devices, like pocketwatches, are rarer and more expensive. The children of aristocrats or wealthy merchants often play with clockwork toys and wind-up automatons.
Lights
Gas and oil lamps are the most common form of lighting in the city. Torches are used in poorer areas of town, or in places where people don't go very often, like basements or the sewers. Only the wealthy can afford electric lights, and they must have a generator nearby to function. Magical lights are not uncommon, as the Mages of the Hermetic Order often give them as gifts to the city or to powerful aristocrats.
Electricity
Electricity does not use wires to travel in The Dark Mod setting, but is instead transmitted like radio waves, from generators to the object using the electricity (similar in theory to Tesla's notion of wireless energy transmission). That's why most electrical devices have metal antennaes on them. Generators cannot 'send' electricity very far, so each house requires its own steam-powered generator, meaning only the very wealthy have access to electricity. Electricity is fairly underused in this society so far.
Guns
While explosive powder exists, handheld guns have never taken off as a weapon in TDM society. Foreign mercenaries occasionally carry flintlock weapons, but liquid fire, gas arrows and steam-powered seige equipment continues to satisfy the city's military needs.