the best way I could find to fight this strange Yoggval is to just force it to be inside the wall during its dashes and force it into the pit during its dives to limit its movement as much as possible, though this does involve spending a lot of time inside the pit. it's also possible to get more damage in using water geysers from teleporting, but I couldn't find a way to do it without taking hits and losing combo, which just cost me time.
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