From the Depths of Hades
There was a low rumbling deep within the Earth near Taenarum, Greece. The rumbling grew louder and louder until it seemed like there was an earthquake. Local residents ran for doorframes. The Earth erupted and dirt, rocks and plants were sprayed into the air. A gaping maw formed in the Earth and the pit seemed bottomless.

The pit was not empty.

Beings and creatures that had not seen the light of day in over two thousands years climbed from the pit and stepped out onto the Earth.