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Thanolekgolo is a form of Lekgolo. The Thanolekgolo colonies present on the Alpha Shard of Installation 04 were resident specimens there, and were part of a failed plan of the Forerunners to combat the Flood, presumably because their lack of a central nervous system made them immune to Flood infection. The Thanolekgolo, are attracted to any form of technology, and will travel in swarms to consume it, they are also very aggressive and will attack any living thing on the spot.