Throughout their naturally long lives many Navigators never stop cease to grow in size, and when their ribs may enlarge to allow for growth of internal gills, they become what is known as an [[Heir Apparent]], separate from the patriarch or matriarch of their houses. Not all Navigators end up evolving to this degree, and few of the elders might not become Heirs. Heirs of different houses feel unshakeable disdain towards those of the different houses, actively assassinating each other before the next stage of their evolution kicks in. In both hierarchical and biological sense , alone above the entirety of the navigatorial nobility rules alone the [[Paternova]], who is the ultimate form that the Navigator can take,.{{Fn|7}} while While able to live for up to a thousand years he still is inexorably mortal,{{Fn|17a}} and upon his death throughout the galaxy Galaxy all Navigators feel their powers wane, ; at this point Heir Apparents loose Heirs Apparent lose many of their normal brain functions, and while they grow even larger , with their gills somehow gaining an ability to breathe vacuum or any poison or water, they become feral beasts keen set on extermination of exterminating any and all other HeirHeirs.{{Fn|7}}

With the last shreds of humanity Humanity they are drawn to each another and then , devoid of those sentiments , start to fight among themselves. With each Heir dead, all others only increase in the ratio extent of their transformation, until only one remains who , with his senses returned , is crowned the next Paternova, reinvigorating the shared powers of Navigators with the linking of his mind. During those elective periods of Paternovas, Navigators powers are impaired, and Warp journeys take longer. However obscure his role is, no one doubts the importance of Paternova for the Navigators' biology, described by them nebulously as the guiding father whose powers transcend the Warp itself.{{Fn|7}}