Possibly required background: Jennifer's Body will be coming out in a few weeks. It stars Megan Fox of Transformers as a demon in high school and was written by Diablo Cody
Make it Diablo(-)(li)cal* and I'll vote for it.
I'd actually have to agree that this one could be better with just two tiny changes of spelling - I'd get rid of the second 'l' because I reckon it would read better without it; and remove the first 'o' so the director's name is spelt right So it would be: Diablo-ical horror.