Lugubraa The Lugubraa were a sentient species , native to the Stratos Distribution , in the Unknown Regions . Biology and appearance . The Lugubraa were a leech - like species , having evolved from wormlike “ chewers ” . They evolved in the Stratos Distribution , which was a large asteroid field fully exposed to the vacuum of space . As such , Lugubraa were capable of surviving almost indefinitely in vacuum , as well as in thin or toxic atmospheres . The average Lugubraa stood on two short , thick legs at 1 . 5 meters , not including a small tail . They lacked eyes entirely , and were physically blind to visual light . However , they possessed numerous spots on either side of their head , which accurately monitored their surroundings for heat signatures . They also possessed echolocation pingers which mentally mapped out their surroundings in radar - like form . The main feature of a Lugubraa ' s face was its large gaping maw , ringed with pink flesh and filled with razor sharp teeth in a circular pattern . The numerous teeth overlapped , and chewed in a gearlike pattern . Once something ( or someone ) entered their maw , it was nearly impossible to escape . They could digest both organic and inorganic matter , able to drain rocks of their minerals . The average Lugubraa was obsessed with fresh meat , however , finding it delicious beyond compare . A Lugubraa ' s smooth , thick skin not only provided protection , but also functioned as their source of hearing . Lugubraa had no ears , and their skin instead detected sound vibrations . Their skin color could be a dark gray , but the majority were a pale grub - like white . They were naturally strong and very durable , able to stand at attention for days on end without rest and suffer numerous wounds before succumbing . Though a Lugubraa possessed four arms , the lower two were little more than saggy , useless stubs . Their upper arms were very long , with five long fingers that were tipped with large suction cups . Each suction cup was filled with needlelike barbs . These dangerous digits gave a Lugubraa extra purchase when climbing or holding down their prey . Lugubraa reproduced by creating a “ splitling ” , which formed on the underbelly of its parent . The splitling detached from the parent once it reached a few kilos in size , and would grow at an extremely rapid pace , reaching full size within a week . Rapid eating of a parent Lugubraa resulted in quicker reproduction of splitlings . Lugubraa younglings required no nurturing . For the first six months of a Lugubraa ' s life , they possessed nothing more than the intelligence of a domesticated animal , and were treated as such by employers or owners . If they survived past six months , they would then mature into a form of low intelligence , able to speak in short sentences and follow more complex instructions . At the age of 50 , Lugubraa would undergo a second cognitive “ kick - start ” , becoming very intelligent . It was these relative geniuses who would lead the species whenever they were present . Society and culture . Lugubraa , whether alone or in a horde of hundreds , were driven by little more than hunger . As such , Lugubraa of all ages , from a week old to hundreds of years , were seen as a cheap and readily available labor . Those who survived to their second cognitive level would deal in credits , selling or renting their horde to others . They would then spend this money not only on themselves , seeking to satiate their never - ending hunger , but also on the well - being of their horde . The elders would buy high - energy food to stave off the prospect of famine amongst their younger brethren , a common problem among overpopulated Lugubraa hordes . Many governments and organizations across the Unknown Regions used Lugubraa mercenaries , and they were well known for their loyalty , tenacity , and deadliness . A Lugubraa would often find themselves used in one of several ways . The most obvious use was as soldiers — indeed , their overwhelming numbers and voracity led many generals to use them idly , throwing them into battle in suicide waves . They were also of use as guards and sentries , as they were able to stand at attention for days on end . Some corporations and governments mandated that visitors to their systems or planets be accompanied by a Lugubraa guard at all time . The organization would tell the visitors this was for their own protection , but it was truly to keep the visitors under constant watch . Sometimes the visitors would even be required to feed and lodge the Lugubraa guard aboard their ship , if they were traveling from planet to planet . Lugubraa were so common in the Unknown Regions that they could be found at almost any stellar - class starport . Lugubraa would rarely wear any clothing , unless provided by their employer or elders . In that case , it would consist of little more than metal or plastoid armor . Because of their essential blindness , Lugubraa were terrible shots with ranged weapons like blasters , and their employers would rarely provide them with anything more than a spear or power lance . If more deadly weapons were needed , they would be given flamethrowers or sonic blaster s , which would cut down wide swaths of enemies without aiming . They spoke their native language , Lugubraal , but were able to speak many others as well , including trade languages of the Unknown Regions such as Sy Bisti and Rammocate . In some places , the rapid rate of Lugubraa breeding created a huge population with no elder control . These Lugubraa were not intelligent enough to control themselves or make profits from their abilities , and as the horde increased further and further , it would result in a general “ dumbing down ” of the group . The Lugubraa would then ravage and destroy entire cities and landscapes if left unchecked , and were even capable of stripping entire continents bare . While this happened countless times on many worlds , one of the most famous occurrences was the devastation of the worlds in the Croke Reach , after the native Croke sought to use the Lugubraa in their civil war . History . The Lugubraa originated in the Stratos Distribution , and were apparently known to the Wharls , who had named the area . The grimoiries of the Gree Enclave , a Celestial client species , considered the Lugubraa to be one of two " curses " unleashed by the Rakata during their war with the Celestials . The Gree named the Lugubraa " the Faceless Mouths " , and further referred to them as " the Eaters of Worlds " . The Croke , while engaging in a vicious civil war among their own kind , introduced the Lugubraa to their homeworlds in the Croke Reach . The Lugubraa proved so tenacious and deadly that for over 300 years , they spread , destroying Croke settlements across the region , no longer under the control of their original employers . One of the settlements they destroyed was Explume Minor . The Croke sought the help of the cloners of Kamino , believing that they needed to fight the Lugubraa with members of their own kind . The Kaminoans created a genetic variant that became known as the Leech Legion , but these clones proved to be just as deadly to the Croke as their predecessors .