Avian Creature?

The person collapsed on the ground was still wearing Vivianne's dress, but her appearance was no longer human. 

The hunch of her back was unnatural, contorting her into a shrimp-like shape, while her once smooth and delicate skin was now full of wrinkles. The most abnormal parts ought to be the lower half of her face which had elongated and hardened to form a sleek, obsidian-black beak, and her nails had grown into razor-sharp talons, glinting menacingly in the dim light. They look like they could easily slice through flesh like a hot knife through tofu. 

Shen Nianzu's jaws dropped in shock and disbelief. Jin Jiuchi's reaction was even more exaggerated as he circled around Vivianne's unconscious form like a detective inspecting a dead body.