Commissioner’s notes:  
Celestia looks down, transfixed by the strange process, and she struggles to gather her wits and resist Discord’s influence. The wave of corruption slows somewhat, but does not stop, and the more of her body succumbs, the strain of holding it back only grows. Outside the castle, the sky darkens as the bright yellow of her Sun starts to shift. A malicious red glow takes over the orb, echoing the changes inflicted on her.
 
Her forelegs seem to dissolve, icy and fiery sensations exchanging each other constantly, until the limbs solidify again. They now feel more slender, ending in digits that twitch when she tries to move. As the turbulent magic fades, it reveals a fox paw and an eagle’s talons in place of her forehooves. Meanwhile, the aura finishes encasing her hind legs and tail, leaving her whole body awash with the chaotic sensation. The strange pressure and tugging are ever present, as if a giant claw held her rear half and molded it like clay. Her cutie mark feels like it’s twisting and burning, sending a shiver down her spine.
 
Moments later, the aura retreats, revealing her new limbs — the legs of a white lynx and a doe. Her more serpent-like body ends in a long, draconic tail, her majestic, flowing strands blooming from its tip. The once bright and friendly sun on her flank gives way to a flaring red star, and emblazoned on it are sharp arrows pointing in the cardinal and intercardinal directions — a tribute to the chaos enveloping her.
 
Celestia draws shaky breaths, fear and doubt chipping away at her will. As the corruption crawls up around her head, she can sense something touch the edge of her consciousness, slipping away the moment she tries to focus on it. She knows that it wants to get inside, setting off an instinctive dread. She resists it with all her might, but with each change in her body distracting her, she feels it slip further in, growing louder in her mind.
 
The princess weakly tilts her head back as she feels the taint flow up against her cheeks. A final moment of panic shows on her face, her fate dawning on her and seeming inevitable. Celestia exhales softly, and her eyes lose focus, slipping closed moments later. It gives her a strangely calm look before Discord’s magic encases her visage, claiming the last pure remnant of the alicorn. With the experience overwhelming her, the presence invading her mind takes this moment to dive in. It is strangely familiar, a “voice” that Celestia knows all too well…