As Elaine sinks her teeth into the Azlu's throat, to finish the beast, to rend and tear with great force, she very quickly regrets it.
The Azlu's body Explodes, instantly decomposing into thousands of tiny and large spiders which fly everywhere, including two tarantulas that are now in her mouth, struggling to get out. The rest of the spiders are fleeing in every direction. With a large mound of dead spiders occupying the space formerly taken up by the body of the azarath.
If you are killing spiders, narrate your attacks, and just roll one die, 10 again.