Exotic

Exotic matter is the term for strange, electomagnetically interacting matter. It comes in several varieties:

• Electronium is the oldest, and simplest - essentially artificial atoms, clouds of electrons lacking a nucleus.
• Mirror matter is an unusual form of dark matter which is a reflection of ordinary matter, sometimes called being 'out of phase' and was considered as a potential form of stealth.
• Hadronium utilizes mirror matter and high-energy reactions in order to form what amounts to a giant, chemically meaningful nucleus.
• Exomatter combines the above three features into what some term call 'something actually useful' - as in, usable in everyday activities.
• Hypomatter warps spacetime itself to form its own reactions. While not always electromagnetically interacting, it often can, occasionally in rather novel ways.