Corrosive skin 1 AT 9??? You sure kidding me!
Try that skll build against a shrapnell crazy sniper. He will push you back and take your tower down in no time, because you dont passively hurt/slow him back.
Did u even read what i wrote
or more defensively: skilling Corrosive Skin earlier
I dont even know you besides what is written in this thread, but with your response u you really showed me that u have no clue about this game. What do you think when v6.83 was released? The Guide was updated for v6.79 and most of it can be applied for this version if not everything and there are different skill/item builds with explanations/justifications.
And if you have more than one brain cell and understand the guide and are able to apply the informations you will 100% improve with viper.
By taking 10min to read it, i definitely have more knowledge about viper than you and i have not played viper since my return to dota.