As many who follow me know, I have my own custom space marine chapter , Blood Rose. I’ve disseminated bits and pieces of lore but thought I’d drop a bit in a nice chunk.
The Blood Rose chapter was part of the 13th founding and is stationed in the Halo Stars region on the night world of Nox. They stand guard over unknown xenos horrors buried and forgotten millennia ago. Specializing in close quarters tunnel fighting in the catacombs of tomb worlds and other, even more alien environments, they favor man portable heavy weapons and dreadnoughts over tanks. The geneseed may have been one of the earliest attempts at full chapter alteration by Belasarius Cawl and produces more psychers than normal, so the chapter has more librarians than most chapters. Minor traits associated with Blood Angels and Dark Angels successor chapters are often exhibited by Blood Rose marines, but officially they are of unknown origin. The founding, mission, and composition of the chapter leads it to have a close relationship with the inquisition, which may have had some influence in the creation and deployment of the chapter to a region filled with ancient xenos threats and technology.
The chapter master: Charon, is himself a dreadnought, guiding the chapter for millennia from his adamantine tomb.
Chapter Librarians adopt the names of mythical demons as a warning and reminder to always be vigilant against the powers of the warp. Even the mightiest of space marines can fall victim to the predations of the otherworldly entities born of that chaotic maelstrom. Etrigan is the name of the current chief librarian with Nicodemus serving as the most senior Epistolary.
The chapter is mostly codex compliant with a few variations to organization and doctrine based on available resources and primary mission. The availability of significant numbers of psykers within the chapter allows for greater use of the emperor’s tarot and other psychic abilities, as well as effective countermeasures against demonic forces and xenos psykers. Dreadnoughts frequently replace armored vehicles as heavy support in the close confines of underground catacombs and ruins, particularly the smaller firstborn chassis that are still maintained by the chapter. Armored vehicle formations are not unheard of, but are rarely deployed during to a combination of scarcity and chapter doctrine.