Need help identifying a Harry Potter fanfic.
Publish date: Before 2010. Given the in-universe period, likely before HP5 or HP6 was published.
Main plot detail remembered: Harry became associated with a rare dark (I think "black" but not sure) Phoenix. Don't really remember much else about the plot though. Just to be clear - this was a REAL BIRD - not Harry's Animagus form or mascot/mark as most fics named "Dark Phoenix" seem to be about.
Size: Novel length. As in, 100+ KB size, at least.
In-universe period covered: I think it starts after year 4 or 5.
Non-typical fic: Normal narrative (as in, no deeply alternate universe differing from prior HP books, no parallel worlds, no time travel, no weird romantic pairings). It's a straight up sequel to the previous JKR book.
My Google-fu seems insufficient to find it - every one I found was some weird Alternate universe thing.