Following the old cliche of the chosen protagoista to save them to all the dimensions of an entity whose corruption is such that they need all the possible help to defeat it.
If you do not like me to start as a cliche, do not worry, it's just a start, because I'm looking for another approach to the typical adventure stories. Courage, friendship, and the desire to continue existing, would look at each other. But, do not focus on just that.
As I said before, see a different adventure story and change a little what people expect.