Gas Damage is one of the six secondary elemental damage types, composed of Heat and Toxin elements. It is particularly effective against light Infested types, but deals lower damage to Corpus and Grineer bodies.
Gas damage's status effect is Poison Cloud, which produces small toxin cloud that deals Toxin damage (notably not Gas damage) to all enemies within its 3 meter radius. The cloud deals immediate damage on proc equal to ( + ) ÷ 2, then does 9 ticks of damage over 8 seconds each equal to . Multiple instances of the effect can stack on the same target with each instance having its own timer.
Because the Gas proc includes the weapon's modded Toxin damage, emphasizing on Toxin mods will have a greater effect than Heat mods. If a proc occurs together with a headshot, stealth bonus, and/or critical hit, the ticks are also affected by their respective multipliers. However, innate Toxin damage from weapons such as the Paracyst does not contribute to the damage-over-time ticks.
For weapons dealing Gas damage without any Toxin mods, the proc will instead deal 1/4 of the base damage per tick. This is only possible for weapons with innate Toxin damage using Heat mods and no Toxin mods, or for weapons with innate Gas damage like the Zakti.
Because the damage from this status effect is Toxin and not Gas, it can bypass Shields/Proto Shields and deal increased damage against Flesh and Ferrite Armor enemies which compensates for Gas's damage penalty against Corpus Flesh and Grineer Cloned Flesh.
Although effective against light Infested units, the status effect's Toxin damage is reduced against Fossilized units. In addition, a Toxic Ancient produces an aura to its allies that provides 100% damage reduction to Toxin and 80% damage reduction to Gas, completely nullifying this element's use against the Infested.
|Grineer Health||Gas Modifier||Corpus Health||Gas Modifier||Infested Health||Gas Modifier|
|Ferrite Armor||Shield||Infested Flesh||+50%|
|Alloy Armor||Proto Shield||Fossilized|
|Offense||Critical Hit • Damage • Enemy Body Parts • Multishot • Punch Through|
|Defense||Armor • Health • Shield|
|Physical||Impact • Puncture • Slash|
|Elemental||Cold • Electricity • Heat • Toxin|
|Combined||Blast • Corrosive • Gas • Magnetic • Radiation • Viral|
|Unique||Finishing • Void|