The guild members of All-Stars were waiting; their eyes were fixed on the front, where two of their members were doing something. Two contract beasts were with them inside a magic circle; one was a humanoid creature with a body covered in silver armor, while the other was an undead horse-type magic beast covered in a strange blackish armor that looked a little bigger than its size.
A blackish-silver-haired boy was arranging the materials in front of him. In front of him was the corpse of a monster with a body that looked like a centaur; the corpse was cut into two pieces. The first part looked humanoid while the other part was of the horse.
He stood up, took out a small black orb releasing blackish smoke constantly, and fed it to the humanoid Knight. He then took some more materials and fed them to the undead horse.
It took a lot of imagination and creativity, I hope you liked the details.