Quintessence is the matter that exists all around - invisible to the naked eye. It is the matter that mages and shifters use to accomplish their supernatural abilities. It used to be mostly regulated to a dome (referred to as a Quintessence Sphere) in the Earth's atmosphere, but after Super Saturation, it flooded out and filled the air on ground level.
- "Quintessence always preferred to be potential with no fixed purpose." (The Sumage Solution, Chapter Fifteen)
- "Quintessence is there. It's all around you, all the time. It's air and light and sound and scent, but only the possibility of those things. You have to tell it what it should be. You must be firm with it, son." (The Sumage Solution, Chapter Eighteen)
- "Did you know, before Super-Saturation, when quintessence was confined to the Sphere, and mages only existed in nascent form, that Victorian scientists called the possibility of power excess soul? Quintessence was different then. Rarer, harder to find, more confined. They called it aether." (The Sumage Solution, Chapter Nineteen)