VX 7 nerve gas (Earth-5875)

VX 7 nerve gas is a nerve agent used by the UNSC Marine Corps, an updated vertent of the VX nerve agent introduced after World War II.

History
Many crates containing the VX 7 nerve gas were spread through New Mombasa during the Battle of Mombasa. The UNSC In Amber Clad had many of them on their possession, and were deployed during the Battle of Installation 05. Later, during the Great Schism, jiralhanae soldiers captured many canisters of the gas, planning to use it to kill the humans.