"The Pulse" was booming out every 15th hour and three factions; Space Wolves, Orks and Tau were sent down to search for answers by their higher authorities, each faction believing that there was something useful which can be turned against their enemies, or something dreadful that must be destroyed. The problem was that the planet is shrouded in mystery and it is very hard to extract intelligence from orbit.

After making planetfall it was revealed to the invading forces that a Genestealer Cult had been hiding on Borhelia for a number of years, awaiting "The Coming of the Star-Children". But the cult was not responsible for the signal. The cult leader was also curious of what "The Pulse" was. 

As the factions probed further into the jungles, marshes and plains of Borhelia, they fought each other and a mysterious native force, totally unknown to all. 

Then... soldiers from all factions started to disappear! And then... the commanders of each force were suddenly gone! And then... "The Pulse" stopped! The remaining soldiers fled from the planet and left the it to its fate. The Pulse - later named as "Signal 15/15" has  never been heard gain.

The fate of the native forces, dubbed by all as "Grounders", is also unknown, but intelligence (such as it is) tells that there are movement on the ground by bi-pedalled creatures, so it is believed that the natives still exist on Borhelia.

Now factions prepare to make planetfall again and, once and for all, seal the fate of Borhelia...