Two thousand years ago the Sartan split the world into five realms, with one race in each realm. Your character, Haplo, happens to be of Patryn who were banished to the deadly Labyrinth.

In Death Gate you are tasked by Lord Xar to retrieve the pieces of the World Seal. Xar wants to use the pieces to undo the split of the five realsm and have revenge on the Sartan.