Azrael

Three-headed, worm-like monsters that can be randomly encountered in Squaresoft's 1990 Nintendo Famicom video game Final Fantasy III. Azraels have 1,100 hit points (HP), are particularly vulnerable to dark-elemental/sword attacks, and worth $940 and 80 experience points, each, when slain. These creatures can only be found inside the crumbling 'Ancient Ruins' dungeon. When threatened, Azraels have the disturbing habit of multiplying, via fission. As such, a seemingly simple battle with a single specimen can quickly get out of hand if you don't finish it off quickly. There is no limit (other than the maximum number of enemy sprites that can fit on the screen) to the number of times an Azrael can copy itself in this manner--the only factor working in your favor is that a duplicate can't have more HP than the original (i.e., an Azrael that has 486 HP left will produce replicas with the same amount of health, and likewise, those clones will only be able to generate 486 HP Azraels as well). Keep hacking away, and, eventually, you'll whittle them all down to the point where they can easily be dispatched with a single stroke. The monsters Azrael and Haniel share the same game sprite, but have different color schemes/attributes.