What planet-encircling event ultimately caused the loss of the Opportunity rover?

Answer

A massive, planet-encircling dust storm blocking nearly all sunlight

The mission for Opportunity ended when a massive, planet-encircling dust storm in 2018 blocked out sunlight for weeks, leading to the last commanded transmission on June 12, 2018.

What planet-encircling event ultimately caused the loss of the Opportunity rover?
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