Leviathan
It comes from beneath the ocean. It rises up from the sea, its form obscured by the night. Its roar, deep-set with piercing overtones lets them know that it is coming. They do their best to prepare for its arrival but against a foe of such size and ferocity they are outmatched. Their village lies in ruins and yet every time it happens, they rebuild. It returns to the sea, resting, awaiting its next awakening, its next intrusion.
Inspired by Godzilla. Feedback as always is welcomed.