The trio froze at the sound of the voice, its deep, resonant tone rolling through the ruins like a thunderclap, commanding their immediate attention. Eren's head snapped toward the source, his dark eyes narrowing as he instinctively stepped in front of Kael, the shard of obsidian in his hand emitting a faint, ominous hum. Kael's hand flew to the hilt of her sword, her crimson eyes widening momentarily before hardening into a wary glare. Even Selene, poised and self-assured, faltered for a split second, her body tensing as her gaze darted to the figure that had appeared seemingly out of nowhere.