ScriptableObject

using UnityEngine;

// Menu: Assets → Create → Game/Data → Weapon Data
[CreateAssetMenu(menuName = "Game/Data/Weapon Data", fileName = "New Weapon")]
public class WeaponData : ScriptableObject
{
  public string     weaponName;
  public int        damage;
  public float      attackSpeed;
  public Sprite     icon;
  public AudioClip  swingSound;
}

public class PlayerWeapon : MonoBehaviour
{
  // Drag the .asset from Project onto this field
  [SerializeField] private WeaponData currentWeapon;

  public void Attack()
  {
      Debug.Log($"Attacking with {currentWeapon.weaponName}: {currentWeapon.damage} dmg");
      AudioSource.PlayClipAtPoint(currentWeapon.swingSound, transform.position);
  }

  public void EquipWeapon(WeaponData newWeapon)
  {
      currentWeapon = newWeapon;  // instant swap — only the reference changes
  }
}

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

// Event Channel — Project asset, independent of scene hierarchy
[CreateAssetMenu(menuName = "Events/Void Event")]
public class VoidEventSO : ScriptableObject
{
  private List<UnityAction> _listeners = new();

  public void Raise()
  {
      for (int i = _listeners.Count - 1; i >= 0; i--)
          _listeners[i]?.Invoke();
  }

  public void Subscribe(UnityAction listener)   => _listeners.Add(listener);
  public void Unsubscribe(UnityAction listener) => _listeners.Remove(listener);
}

// Broadcaster: does not know who is listening
public class PlayerDeath : MonoBehaviour
{
  [SerializeField] private VoidEventSO onPlayerDied;
  public void Die() => onPlayerDied.Raise();
}

// Listener: does not know who raised the event
public class GameOverUI : MonoBehaviour
{
  [SerializeField] private VoidEventSO onPlayerDied;
  void OnEnable()  => onPlayerDied.Subscribe(ShowGameOver);
  void OnDisable() => onPlayerDied.Unsubscribe(ShowGameOver);
  void ShowGameOver() => gameObject.SetActive(true);
}