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

There are 2 interesting points. As I can see, the tomb guard ???? was probably checked, yes, by merging a hero? Or is it visible in some kind of complete collection, or somehow?

2nd point - why were 9 fairies merged, even though there was 1 fairy for retaliation, probably, this is a very significant strategic unit, sorry, I was watching without sound (( if there is something in the comment, I will rewatch this moment with sound.

Also, I want to note that in reality, of course, the tower is a very crucial point with some magic, be it skin (halon), shield (3 heroes - Nila, what, and usually, there is, Peak and Theodore), haste almost doesn't work, but you can pull out gremlins from the environment if you spread them out awkwardly, and of course, the archer )) in general, there are quite a few schoolchildren for the tower... even Nila. And I won't even talk about visiting players ) Adelka rules - the best sister of Nila )

Thank you for the answers )