Its the ‘Own a musket for home defense‘ copypasta but changed Erebus from Warhammer 40K and in greentext form.

>Be me
>Be praying
>Hear a bulkhead smash at 0400 shiptime
>Grab my arming chamber defence sacrifices because that's what the Holy Aurelian intended when he wrote the Book of Lorgar
>Run out of the chamber and see two Ultramarines
>Defile a sacrifice, the first corpse worshipper's head is sucked through his navel
>He's now a spot on the floor
>The ritual gets out of hand and turns subfloors 30-50 to a wall of flesh
>Grab my backup sacrifice and offer them to Tezen
>He answers my plea by transforming my favourite serf in to a pink horror
>It starts to massacre it's way through the monastic deck >Activate my crozius and wallop the second non-believer 15 times
>"Acquire" some new sacrifices in case any more sons of Guilliman arrive
>Fellow Bearers of The Word knock and enter upon hearing the ruckus
>Can't hear or see because of the psychic feedback
>Mistakenly daemogorge the Company's Dark Apostle
>Mauled Ultramarine bleeds out before he can be properly sacrificed because power weapon wounds are impossible to stitch up
>Just as Lorgar intended