It wasn't that strong... Yes, the intensity of this calamity wasn't that strong. The sea water that surged upward didn't harm humans or other intelligent beings and wasn't threatening.
However, that sea water destroyed everything based on Mana...
Whether it was a magic wand, magic array, magic tower, magic storage device, or barrier, it was the same. By contrast, those sea monsters that could be resisted with pure physical attacks were just a little extra.
The sea monsters in the main plane were relatively easily repelled... From the front line, Yila and the others' precautions and preparations seemed overly cautious.
This "sea" calamity might end up being the least impactful calamity... to the main plane.
...
Yes, to the main plane...
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"Boom!!!!!!!!"
In Hell, filled with lava and brimstone, with the surging and raging of the lava lake, countless gigantic lava fish, using their fins as support, jumped onto the shore.