A dark-specter

Hugo observed a cloudy grey humanoid figure hidden in the shadows of the cave walls.

The creature's form was hardly visible to the naked eye. With his magnifying sight, he noticed that its eyes, as dark as the night sky, were fixedly staring at the pool of dragon blood. Its pitch-black mouth opened and closed rhythmically like a fish taken out of water.

It held a dagger that churned with menacing dark energy in one of its pitch-black hands. A single glance at the dagger made goosebumps envelop Hugo's skin.

"The dark specter must have taken advantage of your defeat of the banshee to sneak into the cave. It's waiting to ambush you just as you enter the cave. But luckily, it's only a calamity Grade-A beast and can't pierce through your invisibility." Freya added.