Uppercut part 1:Under city

In this world everyone posses a core. A core can grant one many abilities. One must train their core for the ability they desire. The power to control fire, time control even abilities as simple as making the best cup of coffee. Jack otherwise known as uppercut Jack knows nothing about his past life. A man known as Fighter tells him he knows of his past. In exchange for his memories he must train and represent Fighter in a tournament,to decide who is the strongest.