The Great Halls may not be in good spirit but they are perfectly within terms. Besides the final week those brick walls will be able to be torn down at will without ram. And in teh final 12 hours if you can get to altar you can destroy it without cooldowns. So really the only barrier to you is those great halls. Get through them you can challenge person being sacrificed or it you hold the area last 12 hours you may destroy it.
Good luck to whoever seek to force their will upon the area.