The Necrontyr attempted to overcome their mortality with scientific means, but realized after thousands of years that their bodies could not be changed to survive on the planet. Instead, they developed spacefaring technology, though of a much slower and more uncertain nature than the methods of the [[Old Ones]]. Where the Old Ones were able to move between the stars in seconds, the Necrontyr had to use slow-moving ships, equipped with [[stasis crypt]]s, to reach out to the stars. They clad their ships in [[living metal]] to withstand the rigors of space flight.{{Fn|1}} Despite establishing interstellar colonies, the Necrontyr still could not escape their genetic curse and continued to die quickly from tumorous growths.{{Fn|3a3c}}

Like the modern [[Necrons]], the Necrontyr were organized into a feudal [[Necron Dynasty|dynastic system]] which all pledged fealty to the [[Triarch]], which was led by the [[Silent King]]. Necrontyr society was defined by a rigid system of honour, oaths, and obedience to ones liege. The society was divided into three social classes: The nobility and [[Cryptek|priests]], the soldiery, and the commoners.{{Fn|5}} Necrontyr society was highly ritualistic, and even wars were said to be dominated by formality and procedure.{{Fn|3a3c}} Inter-dynastic conflicts and civil strife were a constant concern for the civilization, as reflected in the [[Wars of Secession]].{{Fn|4}}

Due to their short lives and sickly nature, Necrontyr society was dominated by death. Morturary cults and funeral rituals including embalming and mummification were prominent.{{Fn|3d3a}} Upon waking each morning, Necrontyr had a practice known as the '''Rite of Expiscation''' wherein they would check their bodies for any signs of cancerous growths which heralded their imminent deaths. There was an entire sect of priests dubbed '''Onomancers''' developed to treat their affliction, to no avail.{{Fn|6}}

The Necrontyr put particular emphasis on the astrology, divination, and zodiac constellations visible from their homeworld. Constellations used in their zodiac mysticism included ''Hept''{{Fn|3e3d}}, ''Thot''{{Fn|3g3f}}, ''Vokk''{{Fn|3f3g}}, ''Thuselah'', and ''Kasteph''.{{Fn|3a3c}} These were used in hand symbols by their priests and could also express ideas. Later, [[Cryptek]]s utilized these zodiac hand signs to channel their techno-arcane abilities.{{Fn|3e3d}} Before they encountered the C'tan, the Necrontyr had a pantheon of Solar Gods.{{Fn|3h3e}}

*{{Endn|1}}: [[Codex: Necrons (3rd Edition)]] , pgs. 24-25

*{{Endn|3}}: [[The Infinite and the Divine (Novel)]] :**{{Endn|3a}}: Act 2 1 Chapter 13

**{{Endn|3c}}: Act 3 2 Chapter 101**{{Endn|3d}}: Act 1 2 Chapter 3**{{Endn|3e}}: Act 2 Chapter 34**{{Endn|3f}}: Act 3 Chapter 8**{{Endn|3g}}: Act 2 Chapter 5**{{Endn|3h3g}}: Act 2 3 Chapter 48*{{Endn|4}}: [[Codex: Necrons (5th Edition)]], pgpgs. 6-12*{{Endn|5}}: [[ Codex: Necrons (8th Edition)]], pgs. 9-11*{{Endn|6}}: [[The Twice-Dead King: Ruin (Novel)]] - , Chapter 2