Lifesteal
Healing yourself for a percentage of physical basic-attack damage dealt.
Lifesteal converts a percentage of a hero's basic-attack (physical) damage into self-healing, making it core to sustain-focused marksmen and physical fighters. It's reduced against turrets and minions compared to hero targets, and heavily countered by anti-heal effects like Sea Halberd's Lifebane passive. A fed lifesteal marksman can become nearly unkillable in a straight 1v1 without dedicated anti-heal itemization.