I acknowledge that the Forensic Entomology ability, as seen in The Esoterrorists, can be hard to love. It’s icky and creepy.
And that’s what’s good about it.
Also a favorite of forensics procedural shows, for exactly that reason, I included it as a separate item in The Esoterrorists precisely because it dovetails so well with the horror genre.
Yet it can be hard to come up with new uses for the skill in scenarios.
Once you’ve used the old saw of timing the cause of death of a corpse from the state of the maggots and flies infested the flesh, where do you go?
Sure, you can have a victim infested with a bug or parasite that only comes from certain areas. For example, a body found in a non-tropical environment could show the distinctive flesh-eating qualities of leishmaniasis. The protozoans responsible for this body horror get into people via sandfly bites. That core clue could lead you to discover that the victim recently returned from the cursed city of a monkey god. (You’re all itching to point out that leishmaniasis is not nearly as uncommon as the article implies, with 12 million victims around the world at any time. But hey, when you’re proving there’s a monkey god curse, you have to take what nature gives you to work with.)
But here’s another great ghoulish detail: the apparent blood spatter at your crime scene could turn out to be nothing more than fly spit.
Once your character uses the test described in that last link, she can exonerate the innocent family member accused of a gruesome slaying on the basis of that falsely identified blood spatter.
Having ruled that out, you can then move on to hunt down the Outer Dark Entity that really committed the crime. Maybe it specializes in framing victims, and impelled the flies to spit in a particularly incriminating manner.
Whether you go that far or not, this kind of test is all in a day’s work for our nation’s undersung heroes, the forensic entomologists.