Talk:Damage 2.0/Gas Damage/@comment-474862-20140617065747/@comment-49.144.53.243-20140627084833

It means that the proc effect creates an AoE Toxin Burst that hits all enemies within range AND procs those same enemies with Toxin DoT.

If Toxin alone deals DoT in its proc, then Gas will do it in an area around the enemy that was hit.