A month had gone by, with Elf oscillating between training and capturing magical-girls. She even had her first mission for the ‘clients’ of the evil scientists that had brainwashed her into their obedient magical soldier. A job that could have been done by ordinary mercenaries, and for less, but they needed the money to create more artificial magical-girls, and Elf couldn't (and wouldn't) disobey them.
That said, during the last few days Elf started to act strangely. (For her, at least.) Surprisingly few of the scientists were worried by it.
At least, until she suddenly garbed her head like she had a sudden and very-painful headache. Crying in pain, she suddenly and inexplicably killed the nearest person. Looking at her hands, Elf saw her nails and the tip of her fingers had fused, becoming sharp claws. But she didn't look at it for long, sensing a profound need to kill growing in her, not noticing how she had grown immense horns, bat-like wings, and a long tail ending in a sharp blade.
Rapidly, the scientists ran like headless chickens, trying to flee their creation. Few would be able to, even with the help of magical girls, because F-011 had become a demon hell-bent on killing all of humanity.