Prompt: In the dim, oppressive darkness of the ancient dungeon, the Vaultbound Behemoth looms as a monstrous sentinel, shackled by ethereal chains that writhe and pulse with arcane energy. This colossal monstrosity, standing an imposing 30 feet tall, appears as if forged from the very shadows that cling to its massive form. Chains of otherworldly origin snake across its colossal limbs and torso, their spectral links binding the creature as if attempting to imprison its immense power. These chains seem to absorb the feeble light that manages to penetrate the dungeon's depths, casting the Behemoth in an eerie, muted glow that barely illuminates its daunting silhouette. Its eyes, gleaming with an ancient and malevolent intelligence, flicker in the darkness like distant, ominous stars. The dungeon walls bear the scars of the creature's struggles, marked by deep gouges and cracks as the Behemoth strains against its mystical restraints. The air itself seems heavy with the weight of the creature's captivity, a palpable tension that permeates the subterranean chamber. The Behemoth's movements are accompanied by the haunting clinks and rattles of the ethereal chains, echoing through the cold, damp air of the dungeon. The very ground beneath it seems to resonate with the creature's restrained power, as if the dungeon itself quivers in response to the ancient force held within. As the party ventures deeper into the dungeon's bowels, the Vaultbound Behemoth becomes a living testament to the secrets and horrors buried within. Its monstrous presence, chained and confined, serves as a grim warning to those who dare to delve too greedily into the forgotten recesses of the subterranean labyrinth.