Fairies – their growth rate is higher than that of Necropolis skeletons; they fly across the entire battlefield and attack without retaliation. Psychic Elementals – they attack several units at once without retaliation and are also immune to mind control magic. Phoenixes – their growth rate for level 7 is 4 creatures, which is 2 more than the others; they have fire breath, immunity to fire magic, and can be resurrected.
I don't think I missed anything.

Fortunately, I know the characteristics... 4 Phoenixes – but they have few hit points and are easy to destroy...
I think they created this castle to add variety to the game! What's the point of introducing another castle that is almost the same as the 9th one? It wouldn't be interesting, but the Conflux added some novelty...
P.S. Alex Ghost, this is not a reason to call the castle "cheesy"! If it was created this way, it means that this option was also considered, and the balance was taken into account.

That's why it's "CHEESY," and what is "CHEESY" anyway?