Hive Fleet Dagon - The Deathwatch Arrive: After receiving the foreboding message from the Iaxian 7th Regiment, Lord General Mikal Curas deployed Battlegroup Cerberus, under the command of Lord Admiral Anastasia Arkelius back through the Shadow in the Warp. Her task was to send a message directly to Lord Militant Solomon Tetrarchus and any officer of the Adeptus Astartes regarding this new and terrible threat.Battlegroup Cerberus immediately departed back towards the Iron Collar at all possible speed. The ship stopped once, for their Navigator to realign himself with the Astronomican, and during this brief stopover they encountered the strike cruiser Bellaron.Seeing it was a Space Marine voidship, Admiral Arkelius transmitted the message to them, then proceeded on towards her original goal. What she did not realise was that the strike cruiser Bellaron was currently under extended secondment to the Ordo Xenos to transport the Deathwatch to new locations within the Acheros Salient.Hearing the message, Inquisitor Ghent had the captain of the vessel come to a new heading. The Deathwatch headed directly to Herisor. This new information had to be confirmed with all possible speed. If the Tyranids had indeed come to the Jericho Reach, then there were now more pressing matters to deal with than the recent surges in T'au activity around the Black Reef.Before there was any Deathwatch intervention, fifty Astartes of the Storm Wardens Chapter fought to stop the Tyranids or at least slow their advance on Herisor. Eventually the Deathwatch was sent to aid the Storm Wardens' operations on the planet. When the Deathwatch arrived at Herisor, they deployed in numbers more akin to a typical Codex Astartes planetary siege than the usual small kill-team deployment. More than fifty Deathwatch Space Marines deployed to the surface that day. They fought a campaign that lasted nearly six solar months, until they were convinced that the menace was ended.The Deathwatch aided the Storm Wardens with surgical strikes on Tyranid spore chimneys and synapse creatures with the support of the strike cruiser Bellaron in orbit. From status reports, Inquisitor Ghent became increasingly concerned when he noted that the Tyranids were holding the Chapel of Saint Aret and the city surrounding it hostage. He assumed they were attracted to a relic or something else present in the area radiating a psychic signature.The campaign ground on for solar months and every opportunity was taken to prevent the Tyranid swarm from reaching critical mass. Ghent decided to send a Deathwatch kill-team along with one of his trusted Acolytes to survey the chapel and recover whatever relics resided within. The kill-team, designated Lux Veritatis, reached the chapel and reported the discovery of an Imperial relic of great power.Soon after, they were overrun by the Tyranids and called for an orbital bombardment of the area. All contact with the Deathwatch team was subsequently lost. The Lux Veritatis was later presumed dead after flyby reconnaissance reports noted the remains of armour similar to theirs and that of the Inquisitor's Acolyte strewn about the battle site.After the end of the campaign, when the Tyranid menace had been defeated, Inquisitor Ghent had the planet declared a Death World to ward off any who would be greedy enough to attempt harvesting its natural resources. Of the original fifty Deathwatch Astartes deployed to Herisor, only twenty made it back alive.At the same time that the Deathwatch were attacking the Tyranid force on Herisor, word of this new threat had reached Lord Militant Solomon Tetrarchus. He quickly requested the battle barge Blood Sword to investigate where these creatures had come from.By tracing a line amongst the stable Warp routes, the Navigators aboard the Blood Sword came upon what may have been the first planet infected by the Tyranid swarm within the Jericho Reach. It took three long solar months of Warp travel before the Astartes of the Blood Sword were able to set foot on the planet that was once known as Zanatov's Harbour.