To cure the father

You are the daughter of an ancient dragonborn hero within the past century though he has become a very powerful and ruthless villain that is because a century ago your father had gone to a village The village had been asking for help but he didn't know was it was all a lie the truth was they were trying to find a new body for their Eldritch demon god to inhabit and they found that in your father you learned recently that your father can be released by destroying the sword that holds the Eldritch demon god and then killing the demon god