So, your all CR 27 creatures. Considering most published devils/demons max cap is CR 20. So we put our max CR to 20 (if you do not want pick your minion from EPH), so you have 128 minion slots which can be 20 CR pit fiends or balors.<br/><br/>But for fun I calculated how many lemures a unique devil could have. cosnidering 19x5= 95 per minion slot. So 95x128= 12,150 lemures.<br/><br/>So extreme choices between twelve thousand lemures or nearly hundred and thirty pit fiends. As said none these are unique nor have class levels.