Devastating Everything Underwater!
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These monsters were humanoid Fish-like monsters the locals called Fishmen. These monsters looked more fish than person, but had two arms and two legs, and a long tail to propel themselves across water. Their heads were those of fish of random appearances and held a very simplistic level of intelligence similar to monkeys, they were not compassionate nor had emotions either, so they were barbaric and monstrous by nature.
These types of monsters were in very few quantities in this dungeon and the fishermen rarely spotted them before, but since "something" awakened within the Dungeon by the wave of Miasma they reported to have reached this place before, the Fishmen have multiplied in numbers to ridiculous digits, and were now hundreds, and of all sorts of types, from small, medium sized, and giants.