Somewhere in a dark galaxy, in a dark solar system there was a group of dark planets. They were in the furthest reaches of space, barely illuminated by a sun that was the complete opposite of Earths sun. It was made of dark matter. It made almost no light, covering the solar system in darkness. When you got closer to one particular planet you could see flashes of bright light coming from one section of it. Even closer still you could see the surface was covered in bodies of some sort of shadow men blanketing the ground.
The source of the flashes of light came from a boy of 15. His brown aviator jacket torn in places, revealing a faded blue top underneath. Black cargo pants were on his legs and he wore matching black sneakers. His black hair swayed as he fought off the remnants of a once great and powerful army. Finishing the work he had started 4 years ago. He was gearing up for when he would have to fight the leader. He was a big and powerful entity, at least 100 times larger than the teen in front of him, maybe more. He wore armour made of darkness and his body was pitch black except for his blood red eyes. But as the teenager struck down the last warrior something unexpected happened. The Dark Lord felt fear for the first time in his life, fear of this small boy in front of him. Because he knew the power and rage that the boy had in him, and he knew that he would be too powerful for him alone. So he decided to run and regain his strength, he opened a huge portal and fled. Upon seeing this the teen nearly collapsed from exhaustion. But he knew he had on more thing to do. He stood up and opened a portal to a place much brighter than where he was, the Kingdom of Mewni. Home to King and Queen Butterfly with only one child. Star Butterfly, Princess of Mewni.
"Star Butterfly." He said "I'm coming for you."