"Hail, Eldar. I am Force Commander Randi of the Reasonable Marine Chapter of the Imperial Adeptus Astartes."
"What is your buisness here, Mon'Keigh?"
"We have become aware that this system harbors a Necron Tomb World, a Chaos incursion, and a Dark Eldar army. We are here to cleanse it."
"You're hostility will not be tolerated!"
"We hold no quarrel with you, Farseer. If we keep out of each other's way there's no reason we can't both fight the true threats here. In fact, if we coordinated against the Necrons..."
"I will not be decieved by your clumy trickery! This system was once ours and it shall be ours again! I HAVE FORESEEN IT!" <end signal>
"Your orders, Commander?"
"Prepare to land on the Necron Tomb world, and inform the Battle Brothers that the Eldar are now targets as well. If we can kill their high-and-mighty Farseer, we might be able to route them back into the Webway without much fighting."
"Yes, my Lord."
"Commander! Incoming signal from an Imperial Guard regiment!"
"What? Excelent! Now we can..."
"So, you Space Marines think you can just tromp in on your battle-barge and steal the glory of the Imperial Guard, do you?"
"Well we'll show you! I, Vance MOTHERFUCKING Stubbs, declare myself Govoner-Militant of this system, and will claim it in the name of the Imperial Guard!" <end signal>
"My Lord! The Inquition has arrived in the system!"
"Oh what now..."
"Commander Randi! Don't think we didn't detect you sending a signal to those filthy xenos! ALL IS TAINTED! ALL WILL BE PURGED BY THE FIRES OF THE SISTERS OF BATTLE IN THE NAME OF THE HOLY EMPORER! <DEAN SCREAM>!" <end signal>
"This is going to be a long fight."