Yanfly Engine Plugins is a plugin library made for RPG Maker MV, a wonderful piece of software to help you make that role playing game of your dreams. You can find out more about RPG Maker MV here.

The Healing Link effect allows the caster to be healed whenever the target receives healing from a skill. You can recreate this effect in RPG Maker MV!

You can grab the copy and paste version of the Lunatic Mode code here:

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<Custom React Effect>
if (value < 0) {
  var heal = Math.floor(value * 0.5);
  origin.gainHp(-heal);
  origin.startDamagePopup();
  origin.clearResult();
}
</Custom React Effect>

Enjoy!