Kai

Among the trees of the forest held captive in the grip of winter, stood Kai; the Shadow Warrior who had never known warmth.
Description of Kai: A mysterious being wearing a heavy black cloak with a wolf-fur collar, a conical ronin hat that completely concealed his features, and gripping the hilt of an ancient katana with leather-covered hands.
Suddenly, the snow's stillness was shattered by a metallic scream. Ten masked Rai mercenaries surrounded him. Kai didn't move; he let the wind clear the snow from his sword's blade. In a flash, he charged like a panther; a first blow knocked off their spears, a second cleaved through their armor. The whiteness around him transformed into a lightning battlefield, where his sword danced between their necks like black lightning. In mere seconds, silence returned, and Kai remained standing amidst their corpses, coldly wiping the blood from his blade, then vanished into the trees as if he had never been.