MiniGames/Assets/Scripts/CubeClash/CubeClash_ShockZone.cs

using UnityEngine;

public class CubeClash_ShockZone : MonoBehaviour
{
    [Header("Timing")]
    public float chargeTime = 2f;
    public float activeTime = 2f;

    [Header("Lifetime")]
    [Tooltip("Destroy this ShockZone after this many seconds from spawn.")]
    public float autoDestroyAfter = 5f; // default 5s

    private float timer;
    private bool active = false;

    void Start()
    {
        // Auto-destroy the whole object after N seconds
        if (autoDestroyAfter > 0f)
            Destroy(gameObject, autoDestroyAfter);
    }

    void Update()
    {
        timer += Time.deltaTime;

        if (!active && timer >= chargeTime)
        {
            active = true;
            timer = 0f;
        }
        else if (active && timer >= activeTime)
        {
            active = false;
            timer = 0f;
        }
    }

    private void OnTriggerStay(Collider other)
    {
        if (active && other.CompareTag("Zibu"))
        {
            Destroy(other.gameObject);
        }
    }
}