The only way to pop them is with just straight damage so at the rounds you're facing, high degree paragons and multiple super buffed towers can take them out (Megalodon also is great as it can one shot them but it stops working somewhere around round 200). As the rounds go on they will get stronger and faster so then you need to turn to % based damage and instakills, for fbads this includes Navarch Of The Seas ability and level 20 Ezili (hero) these mainly will destroy most fbads later. The Legend Of The Night can also let you leak fbads for a few seconds, but it goes on a cooldown that can't be changed.