Use /lifesteal set (target) (amount of hearts)
/lifesteal - command
set - argument
target - player (Online only)
amount - amount of hearts, do you set. Limit is 20.
You can use /lfs or /ls instead of using /lifesteal.
Cause PlayerDeath event with dying.
PlayerDeath - event
Every death, plugin automatically remove two hearts from you.
If you have 0 hearts, you will get banned.

This is not the current documentation for the plugin, please use the main page for the current documentation.