Echo Burst, the last survivor of the multipocalypse that completely decimated all of the sentient creatures on Equus, before throwing the world into a eternal winter. She’s faced monsters that would make Grogar tremble in fear, 100 times a day, every day, for 25,000 years  
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In case you are wondering, the multipocalypse is basically many different apocalyptic disasters all occurring at the same time, but not in the same place  
For example, if one place got struck by a apocalyptic level earthquake, the land near it got struck by a apocalypse level volcano, with them not affecting, or even touching, each other