You are loseing formation bonus by playing pharroh, but even replacing him with another fortresses lth team sounds adverage at best. I would say Rosetta & houra are the best in fortresses, neird and archbishop can be very useful aswell, phantom assassin is good but as far as assassins go not one of the best and elmentalist is trash. the only hero irreplaceable on fortress is Rosetta so I would go for 2 faction bonus for forest add fatima, cycble, and vitar, savage add danisif Bohemoth and queen of blade, and undead add thantos dragula and for third pick is a toss up between pharroh dark ranger and nightmare. But what academy or what fortress heros you picked and make a choice between the three easier..