Isodesium

Isodesium is a very rare compound only found on the Cold Side of Tartarus, which has been researched since 2498. It is very stable as a solid, and can be used as an energy source, in fact 60% of Tartarus is powered by an Isodesium Reactor. As a liquid, it is still somewhat stable, but becomes very dangerous to transport. Isodesium becomes a gas at 65 degrees, but is extremely volital. It must be kept in a magnetically sealed Titanium canaster that maintains a temperature under 67 degrees. If the temperature becomes higher than 67 degrees, then Isodesium will explode violently separating all the elements that it was composed of. The researchers at Glacier Peak Research Center, are testing the possibility of creating Isodesium based weapons, to use against the Covenant.

The Isodesium Weapons Project was halted when Tartarus fell in the Battle of Tartarus.