This is what the great LORD says: Let my people go, so that they may worship me. If you refuse to let them go, I will plague your whole country with frogs.
The Nile will teem with frogs. They will come up into your palace and your bedroom and onto your bed, into the houses of your officials and on your people, and into your ovens and kneading troughs. The frogs will go up on you and your people and all your officials.
iirc they didn't really have a death of the firstborn villain, just the final villain wanting to kill everyone which would technically include the firstborn
This is what the great LORD says: Let my people go, so that they may worship me. If you refuse to let them go, I will plague your whole country with frogs.The Nile will teem with frogs. They will come up into your palace and your bedroom and onto your bed, into the houses of your officials and on your people, and into your ovens and kneading troughs. The frogs will go up on you and your people and all your officials.