The liquid inside the vial was cool and smooth as it slipped down his throat, leaving a faint aftertaste that tingled on his tongue. For a moment, nothing happened. Kai and Elena exchanged a nervous glance, both of them unsure of what to expect. The silence in the room was deafening, broken only by the sound of their breathing. Kai was about to speak, to say something reassuring to Elena, when suddenly, a wave of intense heat surged through his body. He gasped, his hands instinctively clutching at his chest as the warmth spread, growing hotter with each passing second. His vision blurred, and a strange, tingling sensation began to build at the base of his skull. "Kai?" Elena's voice was laced with concern, but it sounded distant, as if she were speaking from far away. And then it hit