Hit Life
Leech on a Wep is pretty weak compared to the Life
Drain of Vampiric Embrace/Curse Weapon. Vampiric Embrace guarantees 20% Life Drain, and Curse Weapon guarantees 50% Life Drain (which stack for 70% Life Drain). Hit Life Leech though only has a random range based on the % on your wep. This explains Hit Life Leech, "Amount of Hit Points Leeched".
http://www.uoguide.com/Hit_Life_Leech
Now, back when AoS first launched, Hit Life Leech functioned exactly like Hit Life Drain, which is what made my Necro/Swordsman so damned hard to kill back then in PvP. I used Vampire Form, Curse Weapon, and Breath of the Dead (which has 100% Hit Life Leech), so whenever i hit something, i regained 170% of that damage back as health. Between that leeching, my bandy healing, and SS healing, it took an entire gank squad to kill me. They nerfed Hit Life Leech though over several patches to bring it to the state it is in now.