Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monotonic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.
The atom plays a huge development in the series. It is probably involved in the making on the new weapons deployed on the Western Front in 1904. In the Covert Front Universe, it does not appear in a stable state.