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Here goes...
Haldghast Charadros's vitals were kicking back in. Only his advanced genetics prevented him from perishing entirely. He stood up and surveyed the area. He caught sight of a few of his aspiring champions climbing through the rubble. The soldiers of the false emperor had played their cards well with this latest bombardment, however now it was his turn...
Seizing his staff, Haldghast called for his champions to protect him. He worked away at the ground, drawing hateful symbols that would drive a normal man insane. Finally, it was complete. The pentagram he had drawn radiated a rich purple light, before there came an ear-splitting scream and the star became a portal to the warp. Daemons flew out of the portal, furies flying high into the sky, their screeches echoing through the night.
About a kilometre away, in the fortress of Marythia, brother Damien of the Blood Angels heard a scream.
The fortress was taken in mere hours, red and black daemons swooping over the battlements, overwhelming the defenders, while the black armoured soldiers of the sixteenth legion broke down the main door, boltguns blazing death and destruction throughout the armoured corridors of the imperial fortress. Haldghast took it upon himself to personally sacrifice the gunners that had destroyed so much of his retinue of champions to the dark gods.

WIP

Could really do with expanding on your story. There's not a whole lot to read TBH and if you don't take the time to write something worth reading then people will not comment.
The two paragraphs are the bread of your story. now you need the filling between.
Good luck.