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

But how can we tie in Axoth? I've been thinking about it for a long time, but I have no ideas. Perhaps just mention it in the third and fourth campaigns for the third game, where the events will take place immediately after the cataclysm?

As an option, mention those who went to another world... in the sense, to Axoth... and you can create a connecting campaign... something like that...

by the way, you can connect the fifth game with the third and fourth... someone came from one world, someone from another...