The Mount Tambora eruption was a volcanic eruption that had a VEI of 7.
The eruption was so violent that it changed the weather during a whole year. Causing temperatures to drop down by 0.4 and 0.7 degrees worldwide, causing summer to never come and many agricultural products were either damaged or couldn't be cultivated, causing famine.
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Name: Mount Tambora Eruption
Origin: Real Life
Type: Volcanic Eruption
Powers and Abilities: 800 megaton explosion that caused many catastrophes. Aftershocks were felt for years, and parts of debris were shot almost as far as Calcutta (Point of origination was an island near Java), lead to changes in global weather patterns