idea for a fish you get after beating the final boss (name it yourself)
-design: almost the same as the boss but with some changes (same size as hydra or smaller)
-boost: you leave a medium-sized moon after it runs out of stamina. you can bite that moon and you will have 1.2x damage on your next bite
-bite: instead of biting normally, you dash forward (like the boss does) and then bite
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-bite (ate a moon first): you sink in the water and a red circle appears with a mouth icon (like that boss attack) and then you bite