Dudnak looks like common drowned, but his texture is distorted. The texture has a pink spots and is kinda be offset relative to the model. The mob is quite fast, and makes a periodic damage. Idk, what setting are required to that mob, but I've been playing with high render distance and medium difficulty. Dudnak may be found on the buffet world with ocean/cave settings.Firstly encountered at -573852769389782767 seed.
Site link:minecraftcreepypasta.fandom.com/wiki/Dudnak