Caustics nox gas ability needs a little buff

The problem with his kit in my opinion is that he can't be good at other stages in the game than room/ver close area combat. If you make his gas stronger other charakter can't go anywhere without dying, so u will see in every team a caustic, gas'ing every spot where loot is. I guess his ult could be stronger, maybe instead of a gas cloud an acid bath with a stronger dot or something.