A massive stone structure, reminiscent of a colossal portal, stands imposingly. Suddenly, there's a resounding boom, echoing through the surroundings like a thunderclap. The rock doors, gigantic and unyielding, begin to move. They grind against each other with a loud, ominous rumble, generating an avalanche of sound that reverberates in all directions. The stone doors are shutting, the noise increasing in intensity. With an earth-shattering slam, the stone portal closes completely. The booming echo of the closure lingers, symbolizing the finality of the action. The closing of the large rock portal leaves an eerie silence in its wake, a stark contrast to the cacophony that just ensued.