W.D Gaster received his first test subject, a small human from the surface. Is it a child? Most likely. The child had short, flowing blond hair to her shoulders. She has been put in her small cell until further notice. King Asgore and Queen Toriel did not like this test very much, but Gaster assured them that the girl would come to no harm. Yet. After twelve hours, the child opened their eyes. Her eyes were as blue as the sea, shining as she observed her surroundings. The two have made eye contact, her curiosity intriguing. He labeled her Subject 17A, and that is what she was called. As she grew older, Gaster started noticing that the girl started to mimic his movements, behavior, and language. After observing her for a while, he decided to do something that may be risky. After many troublesome attempts, he managed to take a piece of his soul and forcefully attach it to her human soul of patience. He tried to see if she could open the barrier now. Failure. Gaster scribbled down on his clipboard. Determined to try and set monsters free, he grew reckless. He forced a monster's soul to break and forced it to the human's soul. Not even an hour later, she had an outburst of magic, destroying a few of Gaster's possessions. As she looked around, he saw that her eyes were replaced with ones like his own, glowing vividly. When he should've been terrified of this monster that he created, he was fascinated by how much magic surged through her. Quickly scribbling down his observations, he tried to usher her to the barrier. Maybe this is it, he thought. Maybe if she could do another outburst of magic like that, we may be able to leave the Underground forever! Little did he know that her magic was very unstable, and that she could not control it. She surged with magic, knocking Gaster to the floor, his glasses flew off of his face. Before he could stop her, she had created a portal and left.