The Siege of the Svartalfar

This story is going to be a modern spin on Norse Mythology. The Black Elves (Svartalfar) have lived underground under the rule of Norse Gods for eons. However, now the gods are dead because everyone stopped believing in them. No-one is there to stop the elves from doing what they want. including the Light Elves (LJosalfar) and the Dark Elves (Dokkalfar). The Black Elves make the first move and attack the humans to control both above and below ground. Now it's up to the captured humans to figure out how to stop the elves and put them back in their rightful place.