Ever since a little girl 7 has been tested on by many doctors in a secret government facility, their aim was to make an indestructible warrior to be flown into Russia and destroy the government.  
It's 7's 17th birthday today and the doctor's said that she would be moving to a different part of the facility where they're going to do some experiments on her body. 7 has a huge scar on her right arm from when she was little. They wanted to see her strength so they put her in a cage with a bear and a knife, which lead to an intense battle which she came out victorious but with scars, both mental and physical.   

7 picks up her electric guitar and checks the volume and tunes it. She picks up the pic before turning on the amp. 7 got to strum one chord when the door opened to her cell and Bob-the main doctor- walks in. 

"7, are you ready?" He asks and 7 sighs and turns off the guitar before putting it down. 

They call her 7 for short because she is the 7th experiment they've had, from what she remembers they said all 6 of the other experiments didn't make it through this part of the facility, something about non capability.

They lead 7 down a long white corridor until they opened a door with the name bull marked on it.
Inside held a big metal box over a fireplace and a table next to it. Bob closes and locks the door then faces her.
"In this test, we are going to be testing heat resistance" Bob says when all of the sudden the two guards grab 7 by her arms and the doctor pulls out a needle. 

 "What's going on?! What's happening?!" 7 shouts, panic rising. 
Bob laughs before injecting her with the needle. 7 writhes around in agony as she screams in pain. Whatever was in that needle caused her excruciating pain.

7 was then dragged into the box and a fire was started underneath the box, 7 begged to let go as she felt all the pain of being burned alive yet no matter how much heat was placed underneath the box she would not burn. That injection had done something to her body. She was a freak of nature.
When the doctor was convinced 7 could not burn he had the guards drag her to the next room, the door marked RAKE was opened and she was tied both wrists and ankles to a pulley. The guards then proceeded to slowly rip off each of her limbs. Screams from 7 filled the room until all four of her limbs came off.
 The doctor laughed before injecting 4 more needles into each severed limb, claiming that she now has not only became a weapon but the limbs would reattach to her main body. Shoving a metal through the limbs the doctor then, with the sticking out piece of metal shoved the limbs back into place causing 7 to scream in horrific pain and just as the doctor said her limbs reattached to her body.
Next 7 was dragged to another room, with a trail of blood following her, labeled RAT inside she was chained down and a pole was slowly driven into her stomach. 7 being awake this whole time was going into shock but now able to heal would come out of it just as quick. When the pole was completely through her stomach the doctor stroked her face. 

 "Your doing well 7, all of the other 6 died straight away" Bob said while playing with 7s one strand of white hair. 7 growls and spits in the doctor's face leaving him to only chuckle and get back to the test. 7 felt something move throughout her whole body with mighty strength. Then the pole was taken out of her stomach and the hole in her chest healed proving that the doctors test worked. 7 cried as she knew she couldn't claim to be human anymore. Next he got the guards to shoot at 7 claiming that she was bullet proof and just as the doctor said the bullets bounced off her body.

The last room they took her to was labeled TEETH AND GAS. 7 was chained down to a chair, mouth wide open and the doctor then pulls out a tooth.
After all of her teeth were gone the doctor then replaced them with very sharp teeth.
Lastly, the doctor and the guards put on gas masks and the doctor pushed a button and the room filled with green gas causing 7 to choke on the thick gas. As 7 struggled to breathe something inside 7 snapped, something important, her sanity.
7 began to laugh which confused the doctor, with all the strength 7 could muster she broke free of the chains in which the guards freaked out and began to shot at her. One of the bullets bounced off her body and hit one of the guards, then 7 grabbed one of the guards head and rip it off with brute strength. Still in choking from the gas, 7 then took off the gas mask from one of the guards. She slowly made her way to the terrified doctor. The doctor then pulls out a knife with shaking hands. 7 laughs and walks straight into the knife before leaning towards his ear. "Destroyed by something you created, how pitiful" She says before ripping out his throat with her teeth.