This not a chapter, this is too clear up any confusion with what a grim (main charter) is ie abitles and culture.
Grim- The main charter Night wing (Angel of Death) is a Grim. The best way to describe them is like an alicorn they have the height (like luna and candance not like big C) , strength and the wings but not the horn, instead they have natural magic resistance and "rage". Grim do not have horn but they have magic, but they call it "rage", when they release their magic through the rage their strength and speed increase, but like unicorns they can only keep it up so long 10mins max otherwise exhaust them. Once they release rage there eyes change into a fire blue due to their magic in their blood. Their history is largely unknown but they cling to their tradition and have a vengeance against all demons and their worshipers.Their existence is unknown to most pony's because they prefer the company of other Grims.
They are called Grims because of the fate they face, very few Grims die outside of battle for they see as dieing in vain , due to their fate the Grims they have always been few in numbers. So are usually found alone or small groups wondering equestria hunting demons or mercs, when of group grim form a long term bond together, and the leader is picked for their wisdom and combat skills. Once they are last in the pack they suffer from the effects of the broken bonds this can lead to insanity.
They worship two beings, Reaper and Elune. Neither of them are thought of being good or evil. They belief that they are the embodiment of life and death for that reason they worship the reaper and elune. They take great pride in their weapons/Armour and forge them themselves, Usually engrave the weapons name in ancient equestria into the blade and their names of their bond family into their Armour. They can channel rage into their weapon and Armour lighting the runes in blue fire allow the blades to cut through the thickest hide and the Armour protect the wearer from the deadliest attacks.