[Suzerain of Sheol]

Oh, sorry. I mean in contrast to "mimetically". Diegesis = contained within the fictional bounds of the narrative. "Mimesis" = contained within the broader cultural context that produced the fiction and the subsequent reaction of people's interaction with it.

Or the more common example of music in movies. Mimetic music is the film score, diegetic music is music the characters can actually hear.

Sorry, if I'm being confusing, it's been a good six years since I was in literary theory class, I might not be remembering the distinction perfectly.