This is the beating heart of the Bellarb sector.
Skeras Secundus is a huge, metall rich and cold planet occupied by the imperium since before the horus heresy.
It is largely a mining and manufactorum planet. It's too cold for most human to thrive, but the abundant resources and old manufactorums keep it relevant.
The planetary governor Orva Subail is a cold, self centered but efficient administrator. She and her family have bribed and plottet for generations to get to the position she is in now. She is not going to give up the power.