While other Heavenly Demons were stronger in combat than the Formless Demon, capable of shattering all techniques with overwhelming force and being nearly immortal, their bodies were wreathed in a dense Demonic Qi that was impossible to completely conceal.
The Formless Demon, however, could instantly transform into a perfect likeness of anyone it had seen, even mimicking their mannerisms and mana signature. Even the target's closest companions might not notice anything amiss.
It is said that over a hundred thousand years ago, a Formless Demon appeared in the Cultivation World. She whimsically roamed amongst the various great powers, playfully mocking their prodigies, fairies, and Elders for amusement. The united forces had attempted to lay inescapable nets to trap and kill her on more than one occasion, but she resolved these situations with nonchalant ease. She even disguised herself as an exceptionally handsome man and seduced countless beautiful fairies.
