[i][u][center]Without the Dark, there can be no Light,
Without the Lie, there can be no Truth,
Without the War, there can be no Victory,
Without the Death, there can be no sacrifice,
Without the Hope there can be no Future,
Without the Loyalty there can be no one chapter,
Without the Emperor, there is nothing,...[/center]

[center]You are space marines. The surgically enhanced super-human warriors of the Imperium of man. Each of you stands as a god amongst men, an unrelenting bulwark against the savagery and darkness that seeks to overwhelm you, and eradicate all you have stood for. Each of you is a veteran of countless conflicts, countless lives taken, and countless worlds taken. You stand as one of humanity's best hopes of survival in this, bleak, universe, a rock upon which the rest of the Imperium may seek solace in it's darkest hours...
You must look to the masses of humanity, yet remain weary of even them. The heretic lurks within. 
You must look to your brothers, yet remain weary of even them. The heretic lurks within.
You will face untold horrors, yet be expected to triumph. Suffer not the Xenos.
You must remain pure in mind, body, and spirit. Suffer not the Xenos.
You must serve the Emperor, unflinchingly.
In defeat, dishonour.
In life, battle.
In death.
Peace.
There is only the Emperor.[/center][/u][/i]

You stand amassed before the great launching bays of the Imperial cruiser, “Storm of agony.” At your backs is the very shuttle which shall deliver you unto the jaws of the foe. Before you, is High Inquisitor Turiel Vanatos of the Ordo Xenos. He is dressed in the same menacing black, gold, and crimson that denotes his wing of the Inquisition. The man's flesh is akin to creased and wrinkled leather, his nose crooked, and his eyes burning with pure hatred. He speaks to you, in a booming voice, which even he seems incapable of producing, that rattles your very fibre and can galvanise even the most disloyal of subjects.

[color=#B0171F]“Brothers of the Death Watch! You are here today to rid this universe of one of it's greatest of evils. A loathsome creature which has murdered millions of the Emperor's subjects, and plunged this whole gulf into unending war.”[/color] His voice echoed with boundless passion, and fiery devotion to the words he was saying.

[color=#B0171F]“This monster's name, is Shas'O Bor'kan Ko'pras. Of the pathetic xenos race known as the Tau. Make no mistake, brothers, for this xenos will attempt anything in prolonging his own life, information placing him as a deadly foe and a pilot of one of the many xenos' battle suits.”[/color] For a moment he seemed to falter in his speech only to recover in the merest of moments.

[color=#B0171F]“With all the zeal of the crusader, and with all the devotion that a life dedicated to the Emperor brings. It is with fire and sword that this xenos' life now hangs within the balance. Make his death reality, shatter his followers, cast down his idols and purge all that stands in your way. Suffer not the xenos to live!”[/color]
With that, he departs. You notice that he has a limping gait, aided only by a short walking cane. The High Inquisitor leaves the launching bays, the automated doors slamming behind him. 

The ship's vox crackles to life with the screech of static. The voice of the Captain echoes forth with a litany of hatred.
[color=#33E6FF]“You ask why we must cleanse the xenos. I will tell you why. The filth of the alien and of the witch must be exterminated to preserve the purity of the Human race, lest we degenerate into abomination and savagery.”
“We consecrate this kill team, by the blessings of the Saints, by the blessing of the Emperor. May your aim be true, and thoughts remain pure.”[/color]

With these words in your head, you all board the diminutive Inquisitorial stealth ship behind you, and prepare for planetfall. The interior is sparely furnished, a pair of seating arrays and an Astartes-sized door which leads onwards into the cockpit, wherein dwells your pilot. You do well not to bother him. You each take a seat, you are armed and armoured to the mission's needs, save for your chapter raiments. Guard them well. 

Perhaps the more gregarious of you will use this time to interact with your brothers. Perhaps the more bloody minded with simply enact scenes of carnage in their minds. The time is yours, brother.