Which castle can’t be taken by a Necropolis on day 111?

I think you can attack the Crypt with un-upgraded archers, even from the Castle.

You can;
But you see, Dirty, many players don't write about it, and even say that you shouldn't attack the Tower. The Tower has been discussed... but no one wants to discuss attacking the Castle, Necropolis, or Dungeon. It seems particularly difficult to me to attack Inferno...