How can change a weapons damage.

I have a Rogue Plugin which is used for HCF, dont need to show that code because it isnt relevant to what imma ask. Lets say i have a stone sword how can I make it so that every hit takes away 5 hearts from the player its hitting? How can I set a weapons damage basically! Thanks

 

On EntityDamageEvent, check if it's an instanceof EntityDamageByEntityEvent.

PHP:

public function onDamage(EntityDamageEvent $event)
{
     $entity = $event->getEntity();
     if($event instanceof EntityDamageByEntityEvent) {
          //check if damager is instanceof Player
     }
}

Then check if the damager is instanceof Player.

PHP:

public function onDamage(EntityDamageEvent $event)
{
     $entity = $event->getEntity();
     if($event instanceof EntityDamageByEntityEvent) {
          $damager = $event->getDamager();
          if($damager instanceof Player) {
              //check for iron sword
          }
     }
}

If so, check if the item in the damager's hand is a stone sword.

PHP:

public function onDamage(EntityDamageEvent $event)
{
     $entity = $event->getEntity();
     if($event instanceof EntityDamageByEntityEvent) {
          $damager = $event->getDamager();
          if($damager instanceof Player) {
              if($damager->getInventory()->getItemInHand()->getId() == Item::STONE_SWORD) {
                   //set damage
              }
          }
     }
}

If they do, set the damage.

PHP:

public function onDamage(EntityDamageEvent $event)
{
     $entity = $event->getEntity();
     if($event instanceof EntityDamageByEntityEvent) {
          $damager = $event->getDamager();
          if($damager instanceof Player) {
              if($damager->getInventory()->getItemInHand()->getId() == Item::STONE_SWORD) {
                   $event->setDamage(damage);
              }
          }
     }
}