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PalladiumX
Ligeia darted across the wet landscape. He almost seemed to float, his feet barely touching the ground and having very little weight for such a massive dragon. It was raining, but the droplets passed right through him. Such luxuries were only for the living, or the corpses. Eyes darting, searching for new prey, he spotted a group of hiking dragons. This mountainous region was popular for sightseers even in the most dreary weather.
He sidled up to one standing near a cliff face. He dwarfed the fae but she didn't notice him. Ligiea clenched his teeth in frustration - he wanted to shout and startle her, but they never heard him, not unless...
'You should jump...' he whispered
The fae flicked her frills and suddenly looked uncomfortable, she peered down into the depths, shook her head and walked away. Even when they could hear him, they never listened.
Frustrated, Ligeia swooped further into the valley towards a loch. He had so little impact now. Down below there were horses, and he had to wonder what feeling physical felt like. It was hard to remember. But perhaps, in his current form, he could take over the minds of lesser beings...it was worth a shot.
He phased into a dark grey stallion. He couldn't quite feel reality, but he could control this one. It felt powerful. He urged it to run and bray, accidentally attracting the attention of some young dragons living in a house nearby. They wondered closer with curiosity.
Prey.
Ligeia made the horse trot slowly toward them with friendly eyes. The young dragons - two mirror boys, looked at it in awe. Slowly they came to him to pet the soft grey coat. Ligeia walked it closer to the lake and they followed. One of the mirrors was staring into his eyes suspiciously, but the other was enraptured with the tame wild horse. Only a few more steps...
To the wary mirror boy, there was a great rush of noise and sudden, dreadful, silence. He stood in the valley alone. His brother was gone. He'd seen the horse turn with sharp teeth, it had grabbed his brother, it had leapt for the water. The boy screamed and rushed to the waters edge but there was nothing but faint ripples in the black, cold, water. A few bubbles rose to the surface, then nothing. He ran home sobbing, too afraid to do anything else. Later, his parents would mourn their lost child, and wonder if they'd been wrong to tell their children that Kelpie's weren't real.
(Ligeia has some short lore if you'd like some backstory! He's a bit of a siren)