Spider Mummy

Yeah, everyone knows that the LAD Division has the largest workload. And on top of that, they had to deal with that nasty rat infestation.
I spent some time trying to figure out a long-term solution that's better than just mindlessly destroying the rats. We have spiders at the Headquarters - we bred them ourselves. Yes! Because rats and spiders are bitter enemies and usually stay out of each other's territory. However, when corpses were brought in, the rats went wild, so the spiders are cowering in the corners in terror. Something needs to be done about this!
Let's trick the rodents.
If you can kill several spiders and mummify them, we could use their corpses to scare the rats off for good! Do you think you can help us with this?
Here, you're going to need this mummification balm. Use this generously on ten spiders' corpses and they will remain well preserved. And keep in mind: a quality mummy requires skill! Once you have four mummies, bring them to me. I'll have the lab technicians place them in the crypts.