The Kranua was a specialized version of a Vahki designed in secret by Nuparu and built by a select team of Po-Matoran engineers.1 It was built in Po-Metru.2
Notes
When there was a danger too great for any Vahki squad to meet, Metru Nui relied on two ultimate Vahki machines for protection: the Kranua and the Kraahu. An extremely specialized Vahki model, the Kranua was called into action less often than the Kraahu. Powerful and bulky, the Kranua was capable of transforming its body into animated grains of protodermis. It could then flow through narrow cracks or vanish into the pavement, before reforming somewhere else. This made the Kranua highly effective at pursuing law-breakers into tiny spaces or confusing rampaging Rahi with its sudden disappearances and reappearances.3
The Kranua was powerful and bulky. It was capable of transforming its body into animated grains of protodermis. In this form, it could flow through narrow cracks or vanish into the pavement before re-forming someplace else. This ability made the Kranua particularly difficult to escape from or trap.4
Its intended purpose was crowd control, particularly mass Rahi breakouts from the Archives. Powerful and bulky, the Kranua was capable of transforming its body into animated grains of protodermis, allowing it to flow through narrow openings before re-forming.1