Cristobal’s Back Story
A boy sold to a wizard that loved to perform experiments on young children. This wizard would always buy children off the parents of peasants. The peasants who get their children sold would always be the envy of others because they thought that the sold children will become a wizard's apprentice.
In reality, this was no ordinary wizard but a Dark Wizard. This certain dark wizard buys off children with magic potential. He would then use the children as a new vessel for his soul as his current body would wither away.
The child did not know of this nefarious plot and would just believe that he or she will become a wizard's apprentice. The dark wizard did raise the child with care and support. He taught the child how magic is cast and all the knowledge that he knows because it would be his new vessel after a few years.