MutaNemos in Desert.
Creatures that look similar to real-life anglerfish, they are capable of running toward player in swarms and biting hard.
In the Lab level, sewer part, which are very strong. The player will have to run away from them them, until they find a ladder that is guarded by a Panzerdemon. The Panzerdemon suicides no matter what, after that happens the MutaNemos die along and the end portal opens up.
In the Nuclear Plant, they will appear in the Sewers in an infinite amount until you teleport away from the Sewers. They will appear as soon as you get enough away from the entrance and activate the radioactive waste cloud. These versions are not counted in the monsters counter with the exception of their souls which lets us exceed the maximum. Also, they will drop green souls on death.
- The action which spawns the infinite amount of MutaNemos is called "Bugging".
- The "Bugging" action can be avoided by climbing the pipes on the wall and jumping at a certain point, but the MutaNemos which spawn along the way are still functional, unless you do the same method as well.