Talk:Damage/Toxin Damage/@comment-4448946-20160212180556/@comment-24613667-20160216003105

Toxin deals marks enemies with a damage-over-time effect on proc. Toxin damage type deals bonus damage to Ferrite Armor and Flesh, but deals reduced damage to Machinery, Robotic, and Fossilized health.

[http://Gas Damage Gas] creates a cloud of gas (on proc) that then deals Toxin damage to enemies in within the gas cloud. Gas damage deals bonus damage to Infested and Flesh Infested Flesh, but deals reduced damage to Flesh Cloned Flesh and Flesh.

The thing to keep in mind is that elemental damage multipliers (positive or negative) are always added to each of your attacks, regardless of whether the effects proc. This is the major difference between the two, which is why Toxin is better against humans and Gas is better against Infested.