I know the anther never really explained it besides saying that he was ran over by a carriage or killed by that evil guy, but I have a hard time believing that the best wizard around could be killed like that.
Sorry I forgot to mention that rant was about the previous master wizard :/ my bad
He got ran over by that carriage. Despite him being the famous master wizard, he is still a child and all he wanted was to see his mother, just a child would do to meet their parents after being separated for a long time. A child can die by getting ran over easily.

Why does it have to end??? It was so captivating that I finished it in a day! The story was kind of sad too, why did the previous master died? So sad T-T