I split the chapter in to two parts mainly because Chapter 10 is the longest chapter, and it took me 13 days to plan and write. Anyways, here it is. Enjoy

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A power fist. An iron blade. An ork skull chained to a suit of Artificer Armour.
Tereus ran out of the thunderhawk and on to the dunes, towards a horde of Chaos marines. A command squad followed.
Lucius stepped out of the same Thunderhawk with Severus and a seven-man retinue and three servo-skulls. All of them followed Tereus in to battle.
Elsewhere, Magus stomped towards the first Carnifex armed with the sword and hammer. As the carnifex slashed its first talon towards Magus, Magus slashed a part of its carapace with the edge of the hammer. The carnifex didn't react to the damage caused, it just pierced a hole in Magus' leg, which Magus didn't approve of well. In fact, he threw the sword in to the carnifex's eye, making it scream in dire pain.
Four space marines armed with bolters fired at the carnifex, all accompanied by Chaplain Cassius. The carnifex dropped Magus, making him fall to the ground and let go of the hammer.
On the dunes, Severus slashed at a Chaos marine with his lightning claws, tearing through his armour. Two other Chaos marines fired at Severus, but the impact of the bolter rounds was very weak. As the Chaos marines ran empty on their ammunition, Tereus smited them with his power fist.
Three Inquisitorial acolytes in power armour fired their bolters at more Chaos marines, quite unnaturally bursting holes in their power armour. Lucius joined in by firing four Hellpistol shots at the rest of the squad. Severus also joined in and made it clear it was a bad idea to hang around him, mainly as he was dangerous with a pair of lightning claws.
Magus grunted as he got up. He reached for the hammer but was stopped when a hormogaunt slashed at him. Magus grabbed the creature's scything talons, split them from its arms then stabbed the creature in the eyes with them. Chaplain Cassius reacted to the Hormogaunt by shooting it in the face with his bolt pistol. Hiowever this distraction put the Chaplain to the floor with one of the carnifex's scything talons.
Suddenly, a blue force of lightning struck the carnifex with great strength. Just a few metres away, Tigurius, Ultramarines' Chirf-Librarian, conjured lightning from his gauntlet at the carnifex. Eventually, the carnifex disintergrated and Tigurius stopped. However when he stopped, he fell to the ground on all fours, dropping his rod. He recovered quickly and grabbed his rod from the ground.
Back on the dunes, the Chaos marines were running. There were only a few left, and it seemed Severus, Tereus and Lucius had made it clear that if anything stood in their path, they would clear it by any means necessary.
The three acolytes reloaded their bolters and ran back towards Lucius. Lucius was grinning as if he were happy.
"Should we not chase them, sir?" the first Acolyte asked Lucius.
Lucius shook his head. "That wouldn't be necessary," he answered, "seeing as they're coming back."
And the worst of it was that they were, only with a lot more people. They also had a Land Raider with them.
Severus got furious. "One last time brothers," he spoke, as he approached the hordes of Chaos. "One last charge in to battle on this planet. For the Emperor!"
Magus picked up the hammer from the ground. Chaplain Cassius ran towards him. "Where's young Calgar?" he asked Magus.
Magus pointed toawrds a Trygon. Quite surprisingly, Marneus Calgar was fighting it.
The Chaplain and the Librarian joined Calgar in battle against the Trygon.
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Feel free to comment. Criticism welcomed.
Part II, we look at our hero, Cassius, fighting his way through the tower to stop the forces of Chaos from destroying an Imperial planet. We also look at Marneus Calgar's battle against the Trygon.