Editing Star road

One of the more common types of artifacts left behind by the Precursors, star roads were seemingly inert, several-kilometers-thick,<ref name="s95">'''Halo: Silentium''', ''pages 95-96''</ref> virtually unbreakable cables on an immense scale that lay across the galaxy for millions of years. On some worlds, star roads formed orbital and suborbital structures like [[orbital arch]]es. On a larger scale, they were used to connect and link planets and even entire star systems to one another.<ref>'''Halo: Silentium''', ''page 212''</ref> Like other Precursor technology, star roads were not made of ordinary matter. Described as being "anchored in the deepest layers of unreality", the star roads visible in real space were mere shadows of their exotic [[neural physics]] construction woven between dimensions.<ref name="wf">''Halo: Warfleet'', p. 92</ref> In some star systems, significant portions of locally available mass had been converted into these structures,<ref>'''Halo: Silentium''', ''page 119''</ref> and when active, they were capable of changing their mass at will.{{Ref/Reuse|s95}}

During the last decade of the [[Forerunner-Flood war]], it was revealed that the star roads were not completely inert. Having amassed a sufficient level of sheer intellect to elevate itself to a state of [[transsentience]], the [[Flood]]'s newly-developed [[Key Mind]] intelligences began to take control of star roads, along with other once-inactive neural physics constructs, and wield them as weapons as well as a means of transport.{{Ref/Reuse|wf}} The star roads, in their weaponized form, were incredibly powerful, being capable of either physically tearing apart astronomical bodies and [[Forerunner fleet]]s, interfering with Forerunner [[Slipstream space|slipspace]] travel, as well as generating suppression fields to disable Forerunner weapons, [[ancilla]]s and [[energy shielding|shields]]. The Flood moved star roads across interstellar distances by using the Precursors' neural physics-based method of superluminal travel, which they also utilized to transport their converted vessels.<ref>'''Halo: Silentium''', ''page 213''</ref> The Flood-controlled star roads warped reality around them which not only enabled organic beings to feel when they were nearby,<ref>'''Halo: Silentium''', ''page 253''</ref> but also mutated space-time and converted slipspace to be unsuitable for Forerunner transit.<ref>'''Halo: Silentium''', ''page 236''</ref>

The Flood configured star roads to various formations when using them as weapons. One common star road configuration was shaped like two parallel double-arcs, over 50,000 kilometers in diameter, and contained thousands of interwoven star roads.{{Ref/Reuse|s95}} In the center of each double-bow was a point of inky darkness surrounded by a glowing ring.<ref>'''Halo: Silentium''', ''page 127''</ref> These structures had a constantly fluctuating apparent mass, and were seemingly nonsolid.{{Ref/Reuse|s95}} These double-bow configurations were capable of destroying planets by wrapping around them and causing the planet to crack and shrink; [[Uthera Midgeerrd]] was destroyed in this manner. It was theorized by [[Maker-of-Moons]] that the Precursors moved stars the same way, by forcing changes on their orbits with star road formations.<ref>'''Halo: Silentium''', ''page 106''</ref>

In many engagements near the end of the Forerunner-Flood war, star roads were used to trap Forerunner forces that were soon overwhelmed by the Flood. One example of this is the [[Battle of Kan Pakko]], in which the Forerunners were defeated by the Flood due to the star roads' influence.<ref>'''Halo: Silentium''', ''pages 188-189''</ref> The Flood used star roads to destroy entire systems, leaving only dust and rubble in their wake, and cleanse entire star clusters of life.{{Ref/Reuse|wf}} The [[IsoDidact]] witnessed nine systems destroyed in this manner.<ref>'''Halo: Silentium''', ''page 202''</ref> The star roads were also used by [[Mendicant Bias]] to trap most of the surviving Forerunners during the [[Battle of the greater Ark]], using the filaments to form a large "wall" around the Ark before slicing the structure apart along with [[Omega Halo]].<ref>'''Halo: Silentium''', ''pages 261, 274''</ref>

Since star roads were based upon the fundamental principle of [[neural physics]], they were vulnerable to the effects of the [[Halo Array]]. The first evidence of this was when the Precursor structures on [[Charum Hakkor]] were destroyed by [[Installation 07]]'s test-firing.{{Ref/Reuse|c114}} To all available knowledge, the Forerunners succeeded in destroying all remaining star roads in the [[Milky Way]] when the Halo Array was fired. It was theorized that star roads and other Precursor constructs in slipspace transit may have been able to survive the pulse, although this was not known for certain; to inflict as much damage as possible, the Forerunners would time the firing to a point when the maximum number of star roads would occupy normal space.<ref>'''Halo: Cryptum''', ''page 312''</ref>