My current DW campaign is kind of awesome. One of our characters is a Grave Knight and is kind of working out to be almost the bad guy (from the players' perspective) of the story (even though it will be revealed that he is not).
Along that line, I have an idea for a one-shot where the players will instead play literal agents of the Lord of Bones (one of the 3 lords of death) in the underworld and go on a quest to steal back the fragments of the soul of our only PC who has died so far, and resurrect him (sort of) into the corpse of one of the Grave Knight's undead servitors.
For this one-shot I want the players to make new “monster” characters instead of playing their existing heroes. How can I do that? Are there classes that let you play as monsters, like a lich or a gorgon, or is there some other way that the players can play as monsters?