My insticts telll me to go with a specific Chapter, and, someone once told me that GW wants NEW stories, and, well, f you go look up the Dark Crusaders chapter, theres literally no info, so, its really a perfect Chapter (im going to give the Player a Chapter they can define without breaking any Lore, idk, its important.. (end goal of course is a game propsal to GW for a game about the Great Crusade and onwards where the Player is one of the Lost Primarchs, eh "dreamgame"
"By this Charter,
Let it be known and recorded in the ledgers of the Imperium that the Chapter hereafter named the Dark Crusaders is bound in sacred duty to the protection of the Pilgrim Path.
By decree of Imperial Authority, witnessed and sealed, they are charged to guard the route of the faithful: to shield the pilgrim, to secure the passage, to hold the road against all enemies of Man.
They shall not abandon the Path. They shall not claim dominion over it. They shall not lay down this burden for glory, reward, or relief.
This duty endures beyond campaigns, beyond generations, beyond remembrance itself.
Until such time as the Galaxy is extinguished, this Charter shall stand.
Iter sine fine."