Life Leech

Life Leech is an enchantment added by Cyclic. It can be applied to any Sword up to level II.

Hitting a mob with a weapon enchanted with Life Leech will restore health to the player. Killing a mob with this weapon will restore hunger and health equal to a base amount plus a random amount from 0 to either or 20% of the mob's maximum health (rounded up), whichever is higher.

This enchantment can be obtained through villager trading