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Leech is a game mechanic that regenerates the Health of a character based on the damage that they've dealt. Leech will not heal a player for any overkill damage (damage that is dealt that is higher than the remaining health of the mob).
Leech instances are independent and have a fixed duration of three seconds. All leech instances are removed when you reach full health. 
- Trasochi, Discord, 2019-06-03, https://discordapp.com/channels/368953963267096586/447131834229325845/585194086852591617