<Custom Apply Effect>
target._deathMarkDmg = 0;
</Custom Apply Effect>

<Custom React Effect>
if (value > 0 && attacker === origin && this.isHpEffect()) {
  target._deathMarkDmg += value;
}
</Custom React Effect>

<Custom Leave Effect>
target.startAnimation(101);
var dmg = Math.round(-0.50 * target._deathMarkDmg);
target.gainHp(dmg);
target._deathMarkDmg = 0;
target.startDamagePopup();
target.clearResult();
</Custom Leave Effect>