Moonslasher

Finally, she forced herself to move, but before she could take a single step, the creature sprang. A scream welled up in her as she raised her arms in a futile attempt to fend off the beast. Before the scream could leave her lips, her mouth filled with blood, as slashing fangs ripped out her throat.

Is it human, or a creature from the hell of some long-buried past? Can it be stopped, or will it live forever?