Lifesteal allows you to regain health when you do damage to another player (HP and armor). It allows you to know when you have hit another player after your projectiles go off-screen, because you will see the lifesteal indicator around your character if you hit your opponent. This making this ability very useful for blind sniping or blind rockets.
Lifesteal is good either with 1 ability point or with 6 or more. With 1, the lifesteal is primarily used as a hit-indicator (usually with an assassin-style build).
|Gain HP when dealing damage to enemies|