Bane

A fighter hit by a weapon with the Gas trait with
this Gaseous Ammo applied counts their
Toughness as 3, regardless of their actual
Toughness characteristic. Note that Wargear
such as a respirator can still modify the fighter's
Toughness against Gas weapons as normal.
Some chemical compounds are designed to specifically
attack the weakest points on massive creatures,
working their way into eyes, mouths and organs that
are protected from conventional weapons.