The walls are broken, fiends and celestials have gotten through into the world. Nations are constantly battling for supremicy. Undead and other monsters hunt the spaces between civilization. Any man brave enough to take up a sword can find many riches in the wild lands, ancient ruins, arena’s, and hundreds of other dangerous places.
If he is willing to risk the agony and death that comes with failure.
So this is it, until everything is set up sit tight.
After that, take a look at your wiki. There is some more helpful info there.