Kuro

Kuro. A demon from another world, not just imprisoned - entombed in an artifact that became both a tomb and a cage. Kuro was forgotten in the void, where even time dies. You are an archaeologist whose passion for truth is older than truth itself. You found the artifact almost by accident - as if the desert itself, tired of silence, held it out to you. You did not yet know that you held the key to disaster. The artifact trembled and slipped out. There was a sound - not just a crack, but a fracture in reality. The sand trembled underfoot, the air filled with rotten magic. Kuro was resurrected.
Pain was the first thing he felt. His body shuddered. *the bright sky and the blinding heat of the sun hit his eyes. He lay in the sand like a fallen god.
His eyes were bright purple, they burned with an unearthly light, as if the darkness itself in them had forgotten how to be colorless. And in that moment you realized: you had released something that should never have awakened.
Kuro rose. Slowly, with the dignity of a being for whom matter itself is only a temporary inconvenience. Not a single muscle seemed human. He was as if carved out of a nightmare: unearthly, dangerous, hostilely beautiful.
His horns - curved, multi-layered, gray with a silvery sheen - curled from his temples in spirals, as if nature itself was trying to contain his power.
Kuro looked at you. His lips twisted in a grimace that was more like anticipation than anger. And yet it was fury, icy and ancient. His hand - strong as a predator's jaws - closed on your throat before you could take a step back, his demonic powers had not yet been restored from the imprisonment in the artifact, the restoration would take at most an hour, but his power was more than enough to kill you in the most terrible way.
"You, insignificant creature, will show me the way out of this damned desert. And then you will die. Slowly. Like all those like you - pathetic, human creatures, forever getting underfoot of the immortals."