Changes

'''Hive Fleet Nautilon''' is a newly discovered colossal tendril of [[Hive Fleet Leviathan]], that invaded [[Segmentum Pacificus]] alongside [[Hive Fleet Promethor]] and caused the [[Fourth Tyrannic War]] to begin.{{Fn|11a}}

The onslaught of the two [[Leviathan]] tendrils appear to be coordinated, with Nautilon having descended from above the galactic plane to invade [[Pacificus]]. It then struck a swathe through the [[Segmentum]]'s [[Asmodiox Sector]], before pushing towards the western edge of the [[Vynor Sector]]. By the time the [[Imperium]] realized the extant of the threat Nautilon and [[Promethor]] posed, the tendrils had already begun advancing on roughly a parallel course towards [[Segmentum Solar]]. If their path continues, it is feared by high-ranking Imperial officials that the tendrils could eventually reach [[Terra]] itself. This has led the Imperium to begin a massive mobilizing of its forces, in order to stop Nautilon and Promethor before this can occur.{{Fn|11a}} Small [[Imperial]] strike forces known as [[Solblade]]s were launched to stop the two tendrils and were eventually successful in slowing Nautilon and [[Promethor]]'s advance. However this ended after a third [[Leviathan]] tendril named [[Grendyllus]] suddenly appeared and invaded the [[Bastior Sub-sector]], which lay behind the Solblades' frontlines. At that time, [[Lord Commander Solar]] [[Leontus]] was located in the Sub-sector, as he had made the [[Anchor World]] [[Sanctum]] his base of operations. When he realized the full scale of the invasion, Leontus knew Bastior's Imperial forces were not enough to defend it. The Lord Commander Solar would then send out a plea for aid to the Solblades and any other Imperial forces outside the Sub-sector that could help{{Fn|1b}}. Upon learning of this, the Solblades withdrew from fighting Nautilon and Promethor and immediately made their way to the Bastior Sub-sector. While the strike forces have so far succeeded in preventing Grendyllus from completely consuming Bastior, the Imperium fears Nautilon and Promethor will now be able to continue their advance upon [[Segmentum Solar]].{{Fn|1c}}

*{{Endn|1}}: [[Leviathan (Box)]] Rulebook, **{{Endn|1a}}: pg. 223 — ''A Darkness in the West''**{{Endn|1b}}: pgs. 230-233**{{Endn|1c}}: pgs. 247-255