Storm Callers
A chapter who has the Abactor Company, who steals relics of chaotic nature, the nature of this company is kept secret by the Inquisition. The Storm Callers are hidden near the far reaches of space, at the edge of Segmentum Obscurus. They live on planet Ave, a red desert Planet which is constantly filled with storms and the evolved ant eaters, the Sha. On Ave is the Hive Garden city of Paridisus, one of the most well kept together hive cities, full of plant life, and pale overcast skies.
The Storm Callers have the Reclusiarcs each of them having a different purpose in the chapter, they act like deacons. They have the priest like, Master of Sanctity.
The chapter Master with the plague doctor helmet is Avis Tonitrus.
Before the Primaris were a thing, before the tyranids and the Tau, they’re was the Storm Callers going on the Taninim Crusade, along with the Astral Claws, the Storm Callers were inspired by the other chapter’s strength. Halfway through the crusade, the Storm Callers were called back to Ave, where they saw Paridisus in a blaze, a civil war within rank began, those who opposed the Emperor, were tainted by Nurgle, the blanks in their temple could not keep the chaos at bay. However, against all odds, the loyalists in the chapter persevered, and defeated bands of the Death Guard and their tainted brotheren. Ironic the Astral Claws who pursued the Taninim Crusade, and were victorious, eventually fell to chaos in their entirety, unlike the Storm Callers who failed the crusade, but remnants still remain loyal.
