Devil’s in the Details on Tactician
It’s simple: save-scum above average or near perfect rolls for every turn for every character as soon as you enter the room.
Make sure all of the Mind Flayer’s hits are 19 or 20, make sure the Mind Flayer doesn’t die before Commander Zhalk.
90 minutes later you’ll have it. +75xp all characters. My turn counter showed 9 turns remaining.
Don’t forget to loot Commander Zhalk for a nice 2h.