My new mission The Fire In Which We Burn is now live, or at least still in the review stage depending on when you read this.
It is a Klingon mission - any level.
It is a 45 minute story adventure, best played solo and on normal difficulty. It touches on many aspects from across the shows. Enterprise fans may enjoy it more and it helps to have an understanding of the events of that series, but not critical to play or enjoy.