Harrenhal curse

[TheAzureLiger]

What exactly are the mechanics of the Harrenhal curse? I recall in old playthroughs that it was present even in earlier bookmarks. Would the curse be present for the province in the Century of Blood Bookmark?

IIRC, removing it requires that someone rebuild Harrenhal right? What if Aegon doesn't conquer it? Can a future ruler remove the curse without destroying Harrenhal?

 

[Schwarzherz]

The curse is only active in bookmarks after the destruction of Harrenhal as far as I know. I recall there being a bug, where there is Harrenhal in bookmarks, where it shouldn't been build yet.
If you play Aegon's conquest you can defeat house Hoare without ever going to Harrenhal and it remains intact and uncursed.