A low thrum vibrated through Cactus's scales, an insistent pulse that had escalated beyond mere annoyance. It burrowed into his bones, a curious mix of unease and a strange, almost hypnotic allure. His gaze flicked to Bog, the MudWing's normally placid expression now etched with a subtle tension. "Still hear it?" Cactus asked, his voice a low rumble. He didn't need to ask. Bog's fidgeting tail was answer enough. Bog shifted his weight, his large, flat snout twitching. "It's... louder. And it feels different now. Like it's pulling at something inside." His claws scraped against the stone floor, a nervous habit. Protectiveness flared in Cactus. Bog wasn't easily rattled. Whatever this hum was, it was getting to him. And if it was affecting Bog, what about the younger dragons in the academy? What about anyone else? "We need to find the source," Cactus decided, his jaw tightening. Curiosity gnawed at him, yes, but the deeper, more primal drive was to ensure safety. To understand the threat, to control it, to prevent any harm from reaching those around him. He wouldn't fail again. Bog's eyes widened slightly. "Go into the tunnels? The ones below the history cave? No one uses those anymore. They're probably full of... things." "Precisely why we need to," Cactus countered, already moving towards the alcove that led to the rarely-used passages. "If it's coming from there, it's hidden for a reason. And if it's hidden, it's not good." Bog hesitated, then sighed, a puff of warm air. "Fine. But if we run into any ancient, grumpy NightWings, you're doing the talking." Cactus gave a tight grin. "Wouldn't have it any other way, Bog." He pushed aside a heavy, cobweb-laden tapestry that had been tacked over a small archway. A blast of cool, damp air hit them, smelling of old rock and stagnant water. --- Darkness swallowed them almost immediately as they stepped into the tunnel. Cactus lit a small, steady flame at the tip of his tail, casting dancing shadows that stretched and shrank with every step. The air grew heavier, thick with an oppressive silence that only made the rhythmic hum more pronounced. The thrumming vibrated against his eardrums, a deep, resonant tone that felt more internal than external. It was no longer just a sound; it was a physical sensation, a pressure building in his chest. His scales, usually smooth and unyielding, began to prickle, a sensation like a thousand tiny needles. Bog’s usually calm demeanor began to fray. He walked closer to Cactus, his massive shoulders almost brushing the smaller SandWing's side. His head swiveled constantly, dark eyes scanning the unyielding shadows. "It's like a heartbeat," Bog whispered, his voice raspy. "A very, very slow, powerful heartbeat." Cactus nodded, his thoughts echoing Bog's. The humming was indeed rhythmic, almost hypnotic. It pulled at him, a strange fascination mingling with the growing dread. What kind of power could emanate such a sound? And why from the very foundations of the academy, a place built on peace? They descended deeper, the tunnel sloping gradually downwards. The walls were rough-hewn stone, devoid of any carvings or markings that adorned the rest of the academy. This place was older, forgotten, or perhaps deliberately obscured. Dust motes danced in the limited light of Cactus's flame, tiny specks caught in a slow, swirling current of air. It felt ancient down here, untouched for centuries. Every step echoed, swallowed quickly by the oppressive quiet. Only the hum persisted, growing stronger, deeper, more insistent. Bog let out a low growl, a sound of pure discomfort. His front claws flexed, leaving shallow scrapes on the stone. "I don't like this, Cactus. My scales feel like they're crawling." "I know," Cactus replied, his own scales still prickling. The allure of the sound was intensifying too, a dangerous whisper in his mind, urging him closer. What was it offering? What was it promising? He pushed the thought away, focusing on his protective instincts. He had to protect Bog. He had to protect the academy. This was not a siren's song to be indulged, but a threat to be neutralized. His past failures flashed in his mind, stark and unforgiving. He would not let history repeat itself. Another turn, another descent. The tunnel narrowed slightly, the ceiling pressing closer. The air grew colder, but the humming emanated a strange warmth, a conflicting sensation that made Cactus's mind reel. It was disorienting, unsettling. Bog's trembling was now visible. His entire frame shivered, a low moan escaping his throat. His eyes were wide, fixed on nothing and everything in the impenetrable dark ahead. "It's... inside me, Cactus. I can feel it." "Stay close," Cactus commanded, his voice firm, trying to cut through the hum's influence. He extended his tail, letting the flame flicker closer to Bog's snout, hoping the familiar warmth would provide some comfort. This was beyond anything he'd expected. Not just a noise, but a pervasive, almost sentient force. It wasn't just influencing them; it was *changing* them, subtly, insidiously. He could feel its tendrils in his own thoughts, pulling at his curiosity, trying to make him forget his dread. They walked on, the silence of the abandoned tunnels broken only by their heavy breathing, the scuff of their claws, and the ever-deepening hum. Cactus's focus sharpened, his senses straining. He tried to pick out any other sounds, any other clues, but the hum consumed everything. Suddenly, the tunnel opened into a small cavern. The space was rough, unworked stone, but directly opposite their entrance, a massive, unadorned stone door stood, flush with the wall. It was immense, easily twice their height, and pulsed faintly with a soft, ethereal purple-ish light that seemed to emanate from within. And from behind it, a low, guttural growl reverberated, shaking the very foundations of the mountain. It was an ancient, predatory sound that promised immense danger and an even greater mystery. Cactus felt the tremor deep in his chest, a direct challenge to his resolve. He gripped his tail tighter, the flame flaring for a moment in the sudden surge of adrenaline. What raw power lay behind that door? He could feel Bog shaking beside him, a deep, rattling breath escaping the MudWing's lungs. The growl intensified, a living thing against the stone. This was no mere hum. This was something alive, something hungry, something that had been waiting. They were no longer just exploring a noise; they were standing at the threshold of a caged beast, and its ancient roar was a direct challenge to the peace of Pyrrhia, a challenge Cactus knew he could not ignore. --- They reached a heavy, locked stone door, pulsing faintly with a faint, purple-ish light that seems to emanate from within, and from behind it, a low, guttural growl reverberates, shaking the very foundations of the mountain.

Chapter 6: The Deepening Hum