Shield.cs

using System.Collections;
using UnityEngine;

public class Shield : MonoBehaviour
{
    public GameObject player1;
    public GameObject player2;
    public GameObject shield;
    private float wait = 0f;
    public GameObject particle1;
    public GameObject particle2;

    /*void Update()
    {
        StartCoroutine("Example");
    }*/

    void OnTriggerEnter2D(Collider2D col)
    {
        if (col.tag == "Player1")
        {
            //particle1.SetActive(true); //sets crystal above player to true
            GUIComponent.text = "Immune";
            player1.tag = "Immune"; //player tag becomes immune
            //RobotController.maxSpeed = 18; //increases player speed
            
            
            shield.SetActive(false); //deactivate immune powerup (NEXT LINE OF CODE WILL NOT WORK IF OBJECT IS DESTROYED)
            //yield return new WaitForSeconds(3); //wait for 3 seconds
            
            Invoke("ResetInvulnerability1", 10.0f);
            //wait = Time.time + 5f;
            //player1.tag = "Player1"; 
            particle1.SetActive(false); //sets crystal above player to false
        }

        else if (col.tag == "Player2")
        {
            GUIComponent1.text = "Immune";
            player2.tag = "Immune";
            //RobotController1.maxSpeed = 18;
            

            //particle2.SetActive(true);
            //shield.transform.SetParent(player2.transform);

            shield.SetActive(false);


            //yield return new WaitForSeconds(3);
            Invoke("ResetInvulnerability2", 10.0f);
            //wait = Time.time + 5f;
            //player2.tag = "Player2";
            particle2.SetActive(false);

        }
    }

    void ResetInvulnerability1()
    {
        Debug.Log("immunity is over");
        
        /*for (int i = 18; i > 8; i--)
        {
            RobotController.maxSpeed = i;
        }*/
        GUIComponent.text = "P1";
        player1.tag = "Player1";
    }

    void ResetInvulnerability2()
    {
        Debug.Log("immunity is over");
        
        /*for (int i = 18; i > 8; i--)
        {
            RobotController1.maxSpeed = i;
        }*/
        GUIComponent1.text = "P2";
        player2.tag = "Player2";
    }

}

This script, which is attached to a "Shield" object, is another in-game pick-up. Since all the obstacles and enemies in my game destroy the players by detecting their tag as either "Player1" or "Player2", this power-up changes the player's tag, resulting in them becoming immune to these obstacles. In addition, their GUIComponent text is set to the word "Immune", letting the player know that they are currently immune. After ten seconds, the immunity passes, and their tag and GUIComponent text tag is reset.