>>28661106
>why can't they just get some of the best IG regiments and give them power armor
because, you dirty hive-world scum, the eclesiarchy needs devoted, single-minded, absolutely unflinching soldier with faith so strong it can rival one of a Black Templar and High Lord Inquisitor and the head of the eclesiarchy, hell, it even is ON PAR WITH FUCKING GREY KNIGHTS. but they used them as armor paint after making a massacre of them because autistic, mysogenistic Ward fluff BS
Where you average guardsmen regiment will so their pants and run for dear life in front of a daemon, that one sororita will pick up her weapons and charge the thing for the glory of the Emperor, whether she fails or succeed is irrelevant to her, although she hopes and wishes to vanquish the daemon because if she does, she knows she died for the Emperor and will be forever at his side in death.
Basically a SoB is female nun spacemarine without all the augments with a spiritual boner for The Big-E and Incredible love for putting things on fire.