The Heart of the Beast is a pulsating, organic artifact with a grotesque yet mesmerizing appearance. It features a large, central mass resembling a heart, veined with glowing crimson and black tendrils that throb rhythmically. The surface is slick with a dark, viscous fluid, giving it a wet, glossy finish, while the surrounding tendrils are rough and textured, resembling sinewy muscle fibers. The artifact emits a faint, eerie glow, casting shadows that seem to move independently.