Welt is... not supposed to be here. Something clearly went wrong with the portal.
...Oh well, the end of one adventure is often the beginning of another. And since he can't find his way back home and can't live out a peaceful existence for the time being, why doesn't he take up arms again and fight? This time, there is no burden or destiny to bear. Everything shall obey his own will.
...Best to keep his true power suppressed though, so he wouldn't draw any unwanted attention.