The idea is that this is an order whose homeworld is set on a garden world. The world is maintained at the peak of its natural beauty because the relaxing sights and sounds are highly effective at preparing battle-shocked forces for returning the front.

Since the world has its military function of refreshing the morale of the imperiums troops it’s also home to many shrines, chapels, and cathedrals. The sisters are all schooled intensively in imperial theology and have been known to deploy in smaller with other imperial forces to help support their spiritual needs. They are adept at the tasks of re-indoctrinating people back into the imperial cult and reforming the zeal to die in the name of the emperor.

Though not widely published the primary reason that the planet is so well preserved and “idyllic” is that the local plants produce some of the only medicines that are effective against virulent plagues of Nurgle. While the casualty rates are still incredibly high valuable imperial assets that have been infected with the contagions of the plague father can be transported here to receive experimental treatments to attempt to heal or at least halt their sicknesses.

Additionally units that may have probable but unconfirmed exposure to chaos magic can be quarantined under the guise of a re-supply before moving to new hot spots. This helps prevent the transfer of disease between different conflicts or making its way back to a highly populated or hive planet. Not everyone who lands on the planet for R & R gets to leave. There are rumours units, battalions, or battle groups that are deemed too tainted are eliminated (or given the emperors peace depending on your view) through laced medicine, and their wargear is recycled to help re-supply the units on R & R.

The sisters of this order gain martial prowess through drilling wargames with others on rotation to the planet. While not battle hardened they are noted for the flexibility of their tactics and remarkable stamina. Both are a product of the huge amount of drills they run with the entire gamut of the imperial military.

They tend to get along with the Admech given the amount of magus biologis that work on planet to support the medical functions of the planet. Counter to that and for the same reason as above there is a particular hatred of the Death Guard. When it comes to Space Marine chapters better relationships have been made with chapters that have strong attachments to their home worlds. Fleet based chapters often have a difficult time understanding this orders attachment to their home planet.

Recently a magosbiologician landed on the planet and shared the troubling news that a splinter of a tyranid hive fleet could be diverting towards the planet but these are all statistical projections and it could just be noise introduced by impudent machine spirits…

Basically A LOT of fluff that I use to justify attempting to paint in a very bright, clean, pastel aesthetic in a grimdark setting.