Viper

Viper the Netherdrake is a ranged agility Hero who can function as an excellent ganker and carry due to his slowing auto-attacks and his low cooldown ultimate. Although ganking is often made easier with Viper's presence, his true carry potential is revealed with sheer item power. Farming with Viper is relatively easy. However, active participation in ganking is very important before his ganking power wears out in mid-late game, due to enemy heroes playing more cautiously and obtaining better items. Orb-walking with Poison Attack makes Viper very potent in hero harassing and pushing. In the hand of a pro player, Viper can be very deadly.

Viper is one of the few easier heroes to use, having great harassing ability and easy farming capability. He is recommended for new players.

Tips
Nethertoxin affects buildings, so it helps Viper push.