the factory is the most difficult boss in the game. I just give up. I am full level 100 in full legendary equipment with catzilla on my side. I have 5 attacks ( approximately. 4 guaranteed + catzilla) in a turn. the factory have 5 thousand hp. 2 barriers and summons a level 100 unit every turn, starting with 3 units and overclock one if there is no dead units to replace. Ok i kill all units and deal dmg to a factory kinda 100+ dmg per hit. Cause it is a level 100 building. When factory drops into a yellow zone ( half hp) it just spams battle android every turn. It spawns with taunt and makes an insane hit that destroys bubble/taunt with huge dmg and leaving a mark. It just spawned 5 androids in a row and if i dont break 2 barriers on the factory it restores 500 hp. I deal 100+ with 1 hit.
It just unfair fight. At this point i have only one more thing that left to try - 3 falmethrowers/homewrekers + 2 haste and some defense on sam. If that's the on;y possible way to solve a boss - that's a bad boss. Because it is not interesting or difficult boss. It just annoingly unbreakeable with only 1 strategy seemingly effective enough against it. Strategy that requires nothing but grind of a proper equipment to toss straight after a bossfight.
P.S. Seriously, why 2 barriers? Was one not enough? Not enough that it scales with your level, you can't find it at will cause it is a random event, it spawns a unit every turn and overclocks them?