Green Globs
Green Globs are an experiment of the Guardians of the Universe little known to the rest of the universe. They teach lessons to individuals whom they deem need it. They are over 3.5 billion years old.
The Guardians of the Universe created the Green Globs over 3.5 billion years ago. Unlike their policing forces (i.e. the Manhunters; the Halla's; the Green Lantern Corps), the Green Globs are a little known. Their function is to teach "lessons" to individuals throughout the universe. These machines are composed entirely of cohesive plasma with near limitless energy thus allowing it to operate indefinitely without recharging (unlike a green power rings).
The Green Globs are virtually undetectable (only a small frequency of green light can react to it). Their true Oa'n designation remains unknown and are simply referred to as Green Globs.