The answer is: Plague of Darkness|Darkness

Exodus 10:21 - Like the third and sixth plagues, this plague was unannounced to Pharaoh. The darkness was an insult to the Egyptian sun-god Ra (or Re).

The ninth plague, shrouded in thick darkness, wasn't just a physical event; it was a profound geopolitical statement thrown annoyingly at the booming Egyptian culture and their pantheon of deities, including Ra, the sun god, who reigned supreme in their thoughts. Imagine living day after day under a sun that caters to nearly all your existence, only to find it completely snuffed out! This darkness lasted three days, a time period significant in Hebrew Literature. The deep darkness serves as an eerie violation of the natural order, causing disruption throughout Pharaoh's realm.

Curiously, this wasn’t just a blackout but a symbolic act—one that emphasized the impotence of Pharaoh's gods when measured up to the power at play. The Egyptians cherished light, viewing it as life and enlightenment, whereas darkness is often associated with chaos and despair. The emotional atmosphere was heavy, leaving the people trapped in this unrelieved gloom, paralleling their entrapment in a society that subjugated the Israelites.

Interestingly, Egyptian texts speak about similar themes of darkness as a precursor to plagues, thus layering historical context over this biblical account. In this passage, there's an invitation to interpret natural phenomena as reflections of divine actions capable of surprising societies formed on might and fear. The resulting dialogue questions carelessly held beliefs and perhaps sparks the light of questioning—questioning liberation and justice, a theme echoing even today.