In Destiny: The Taken King, you're off to murder a god.
No no, don't worry. It's cool. Not only is dead-god-walking an evil space demon scourge of the galaxy, but he's also the dear old dad of a god Destiny players already murdered in The Dark Below add-on. So while Papa God might be out for some perfectly understandable vengeance, you're really just safeguarding the fate of our species. NBD.