On a barren iceworld somehow deemed valuable by the Imperium, an alleged uptick in genestealer cult creation has convinced the Ecclesiarchy to deploy the Order of our Wolfking of Battle Sisters to deal with it.

This world is primarily used for freshwater extraction — Terra needs it's drinking water, and much of it after all — and in the worker facilities near one of the pumping stations, Sister Astrid is in interrogation duty.

Several workers are lined up on the wall, her holding her power axe to the back of their necks. A much more effective method than a bolt pistol, in her opinion.

In her thickly Valhallan-accented Gothic, she asks them,

"Where is the ringleader among you wretchous heretics?"

As she gets to the end of the line, and answers with it, the door next to her (leading out to the outside) opens up. She cranes her head over to see what's up.