Maggot doom 3

From Doom Wiki

A maggot as seen in doom 3 is a easy to kill but very swift creature. It's known for it's speed and it's abillity to both crawl and run makes it a worthy opponent. But it should not be under estimated for it can do a painful jump attack that is extreamly difficult to avoid. So it's not the weakest enemy in the game but not the toughest either "obieously" due to the extreme amount of sickness you get by it's introduction it is quite sickening. after killing some zombies and Z-secs you will enter a room and a cutscene will trigger showing a heavily breathing body with it's torso bloody and ripped open with a visible rib cage and some growth around it it's tied up to the wall and maggots will appear from the vents and attack you they will easily go down with a shot gun blast at point black range.