Do you have a write-up anywhere talking about your Order of the Black Flame? It obviously seems like a cell of the Order of the Silver Dragon, but I'm curious as to what you've written and its inspirations!
The order of the black flame is a sort of twisted and expanded version of the order of the silver dragon that is lead by Osric the character I played in an old curse of strahd game. My pc's goals were vengeance for his murdered family and to punish himself for the perceived sin of being unable to save his family.
Naturally when he got to the amber temple he got everything he wanted but nothing he needed aka he made a deal with an evil demigod of death and vengeance for ... death and vengeance lol. As part of this deal he gained control over some of the revenants from the Order of the silver dragon. He also gained the ability to create more undead and was implied to be turning into a deathknight. At the temple Osric also found and killed the person responsible for killing his family and discovered that this person had come to the amber temple to become the champion of another evil god. And around this point is where our campaign wraps up.
My post campaign head cannon is that my pc is creating cult/ knightly order called the order of the black flame dedicated to worshiping the evil god my character is the champion of and killing the evil god that killed my character's family. Aka Osric is trying to nosedive the plane as hard as possible into the ground so he takes himself, everyone he wants revenge on, and everybody else on the plane out in one big michael bay explosion. Members of the order of the black flame are all desperate for some sort of vengeance and join in exchange for power/ help to get revenge. High ranking members are almost all ritually executed and raised as powerful undead.
For the most part the order of the black flame is just a personal art project for me now. Also a lot of the art I'm doing now has very little to do with the original dnd campaign or dnd in general. It's a way for me to experiment with character designs and make a lot of weird unmarketable art that only appeals to me. Honestly a lot of it is just hot air and vibes since I'm not a writer or a world builder. I just like gothic armor, cathedrals, and dead stuff so this is one big excuse to draw that shit all the time.