revival/game/Assets/Scripts/Traps/FallawayFloor.cs

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

public class FallawayFloor : MonoBehaviour
{
    // Speed at which the object moves towards the ground.
    public float speed;
    // Time it takes for ogjecct to begin moving towards the ground.
    public float fallAwayTime;
    // Time taken for object to be destroyed.
    public float destroyObjectTime;
    public Material dissolve;
    Rigidbody rb;

    private void Start()
    {
        // Get Rigidbody component.
        rb = GetComponent<Rigidbody>();
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Player"))
        {
            // Start the Destroy floor coroutine and switch to the dissolve material.
            StartCoroutine(DestroyFloor());
            GetComponent<Renderer>().material = dissolve;
        }
    }

    IEnumerator DestroyFloor()
    {
        // Take fallAwayTime, speed, and destroyObjectTime from editor and apply
        yield return new WaitForSeconds(fallAwayTime);
        rb.velocity = Vector3.down * speed;
        yield return new WaitForSeconds(destroyObjectTime);

        Destroy(gameObject);
    }
}