Frost Beetles were known to break into Knowledge Towers and, once inside, to consume the Memory Crystals held there. Matoro suggested that these Rahi gained their above-average knowledge by devouring the crystals.
After the Matoran of Metru Nui were rendered comatose in the Great Cataclysm, Memory Crystals fell out of use. When the Ko-Matoran resumed work in Metru Nui, Memory Crystals were once again used to store information.
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