Location: Main D'ni Cavern, Earth.
A solemn figure walked through the ruins of a long gone city. For more than 10,000 years it housed a powerful civilization. Now, there was nothing. His gaze moved from the lake that gave a twilit glow to everything toward the arch that used to be the most prominent figure of this lost city. The memories flooded back into his mind, he remembered when his world was this cavern. Now, there was nothing left.
He kicked a rock off the cracked sidewalk, wishing there was something he could have done to avert the calamity. He sighed as the stone plunked into the water, remembering his childhood in this place. He continued on, his footsteps echoing throughout the city, a ghostly shadow of the thousands that died during that holocaust
Suddenly, another figure shimmered into existence next to him, it shuddered for a moment, then looked to the first. This newcomer wore no clothing, unlike the other that wore a large cloak. The newcomer wasn't human, either. It is gray, insect-like, and nearly resembled the stereotypical appearance of an alien, right down to the glowing blue eyes. It chirped to the first one, "D'raekmus, it is time. We must leave, we must learn to let go of the past, we must remove our attachment to this dead place."
D'raekmus smiled, "True, but we cannot move on to the new world just yet. I must first wander another Age, as I have some unfinished business." With that, he put his hand on the other's shoulder.
"You know where to go, let us go."
Both figures vanished from the cavern, even as a group of people entered and looked from the same place that, little did they know, the person who knew all its secrets stood just moments ago.