Sure, please feel free to use whatever terminology you want. I just came up with the “Anti-“ prefix because it’s appropriate and works well, and lore hasn’t given any kind of title to the rivals of the siblings. In the game and lore Hives-Bane and Crota’s Bane have been used because we killed Crota and a ton of Hive, and I’m not sure what to think of Eris running the Crota’s Bane faction thing. It’s all a little weird and the faction thing is sort of the result of this being a video game, I think. I’m not sure how well it applies to the rivals of the Osmium siblings, though. I don’t recall Oryx-Bane ever being a thing, and it’s complicated because Eris was Oryx’s equal but we killed him. And we have yet to see what happens with the other siblings and rivals.