- Water Vapor
- Tritium
- BZ
- Nitryl/Brown gas (or whatever it's named right now)
- Hyper-Nobilium
- Stimulum
- Pluoxium
The Supermatter has five components to it that the usual suspects influence: Temperature, waste gas production, power transmission, heat resistance and power decay. Therefore, it would make sense to affect these when discussing this topic. My suggestion follow the following lines:
As Tritium is effectively a more volatile version of plasma, it would make the most sense to make it function similarly to plasma but with a greater degree of danger. Massively boosting power transmission, waste gas production and crystal temperature.
BZ gas gas's properties are hallucinogenic in nature, perhaps its presence could reinforce the crystal's heat resistance greatly at the cost of making it cause vivid hallucinations to those exposed to it without meson scanners on, even for a few seconds.
Brown gas is acidic in nature, perhaps it's presence causes constant damage to the crystal but boosts it's power transmission equivalently to oxygen.
Hyper-Nobilium is an easy one and I'd suggest giving it freon's old properties.
Stimulum is the safer and stronger version of brown gas. I'd personally have it so that it boosts the Supermatter's power transmission to the same level as plasma without the downsides - very little waste gas and heat is produced.
Pluxoxium is produced by CO2 being exposed to radiation and as such, could act as a safer alternative to CO2. Counteracting the energy decay to a lesser effect without affecting the crystal's other properties. Still dangerous if you use only pluxoxium.