Utterly Mad

Nevercold Brass
Mass: 10 kg/liter

This metal produces heat due to it's natural reaction to background radiation. The metal naturally responds to background radiation by producing heat. The metal is also more conductive then copper by approximately ten times.

Only the Golems know how to produce it.

Scintillack
Mass: 5 kg/liter
This alloy is infused with an odd form of lichen that permeates light. From research this lichen is similar to the Earth lichen that glows in the dark, though this lichen produces light constantly and is much brighter. The metal becomes infused with this lichen under extreme pressure due to the odd properties of the metal.
Thus far the only material the metal has this type of reaction with is the lichen that's used to produced this type of alloy. The producers of it are currently unaware if there are other materials it will react in this way to, but so far all experiments have failed.
So far this glows brighter then most light producing implements.

Only the Golems know how to produce it.

Prisoner's Honey
Mass: 5 kg/gallon
Prisoner's honey is a mysterious substance produced by The Golems.
It can be very addictive. It’s an opiate which makes people have vivid dreams known as ‘honey dreams’, it is used to trade with other civilizations.

It produces these effects by having nanobots enter the bloodstream and take partial control of the brain and nerves temporarily transporting someone into what feels like real life but within a dream.

It is made with mysterious technology that no other person has the knowledge of apart from the golems.

(just gathering up stuff here for Tesla, editing some stuff, everything is subject to change)