How can we connect the fifth installment with the previous games in the series?

I suggest the following...
After the Day of Reckoning, few survived and began to rebuild Enroth. Centuries later, the inhabitants forgot the memories of the Day of Reckoning and began to consider it a creation! They started calling the Ash World of Enroth, Ashan! If you are interested in my version, write to me in a private message...