There is a 1-2 second delay on a turn that your team gets a defense or attack stack buff if you have picked the specific rare blessing. When the maximum amount of stacks (10) has been gained, the delay is gone. I was wondering if this is intentional as I think its not fair for the players to get punished on their scores (because this delay is significant - you lose around 20 seconds in total) for picking this blessing without having a clue about the delay beforehand. You can’t change the blessings you take after all.
I also think that this delay was not in the game during the previous events, though someone with better memory is welcome to confirm this.
You can find video proof of this here: Tower of magic turn delay on stack blessing - YouTube