Stun gas

is a gas that applies the stunned by gas effect to creatures caught inside that are capable of respiration. The effect is dependent on the density of the gas, reducing the quickness of creatures by 30% at 40 gas density and lower, 60% once above 40 gas density, and fully immobilizing them at 60 gas density and above.

Sources of Stun Gas

 * and
 * The Stun Breath mutation from consuming a or  or cooking with  or
 * and
 * The Stun Breath mutation from consuming a or  or cooking with  or