Crater - Prompt 18

Amongst the ruins of a once-great city, the anomaly of the enormous crater was a shock to all those who came across it. Ruinously large, it covered nearly half the blasted city, immediately ending all life around it.

None could explore too close to the crater, as the thing seemed to birth foul creatures from it's center. It's said the few adventurers that got close could hear soft singing from its center.