Unity Buff System Solution for https://www.jonathanyu.xyz/2016/12/30/buff-system-with-scriptable-objects-for-unity/

Firepoint.cs

public class Firepoint : MonoBehaviour
{
  public float rayCastDistance = 10f;
  public LayerMask layerMask; // Assign the desired layer(s) in the Unity Inspector.
  private EnemyHealth enemyHealth;
  float damageOvertime = 5f;
  SpeedBuff speedBuffScriptableObject;
  private void Start()
  {
    enemyHealth = FindObjectOfType<EnemyHealth>();
  }
  private void OnDrawGizmos()
  {
    // Draw a line to represent the raycast direction and distance in the scene view.
    Gizmos.color = Color.red; // You can choose any color you like
    Vector2 rayDirection = new Vector2(Mathf.Cos(transform.eulerAngles.z * Mathf.Deg2Rad), Mathf.Sin(transform.eulerAngles.z * Mathf.Deg2Rad));
    Gizmos.DrawRay(transform.position, rayDirection * rayCastDistance);
  }
  private void Update()
  {
    float angle = transform.eulerAngles.z;
    Vector2 rayDirection = new Vector2(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad));  // DYNAMIC ROTATION 2d SPACE

    RaycastHit2D raycastHit2D = Physics2D.Raycast(transform.position, rayDirection, rayCastDistance, layerMask); //specific mask

    if (raycastHit2D.collider != null)
    {
      /*Debug.Log(“Hit ” + raycastHit2D.collider.gameObject.name);

      BuffableEntity buffableEntity = raycastHit2D.collider.gameObject.GetComponent<BuffableEntity>();
      if (buffableEntity != null)
      {
        var timedBuff = speedBuffScriptableObject.InitializeBuff(raycastHit2D.collider.gameObject);
        buffableEntity.AddBuff(timedBuff);
      }
    }
  }