Final Boss Cannot be defeated

[Qamok]

He just destroyed all my towers and i can only watch. After he splits in to bloobs i dont have any towers to actually destroyed him and after that he actually vanish more of my towers. This dont have any sense, its tower defense nd game receives my ability to make towers.

Spend 3 hour with different towers and tactics and final boss after 15 waves is always the same, he just destroyed what i build and game over

[Osiris]

You should try to purchase just enough towers and upgrades to get to the boss, but no more than you need. Then you will have a lot of money left to immediately buy new towers when they are destroyed by Umbra. Save up for the last wave, that's all there is to it. Good luck.

[Gear D4C3]

^

I have beaten that level just today again after a long time with Bonehart + upgrades on normal.
I remember not spending too much money in the end because he will destroy your towers and you are left empty handed.
But today I pretty much had little to no money left and was still able without loosing hearts to beat the boss but I had also little to no towers left and only some few baracks and two good towers, the fire spell killed him in the end.

In addition to saving money one further strategy also helps, (re-) build many tower slots with cheap lv1 towers.
He destroys towers rather randomly so you can increase your luck if you have some trash towers rather than a few fully upgraded towers and empty tower slots.

And as said, use your fire spell on him multiple times it really helps a lot.

[Osiris]

I experienced it exactly as you described, haha. I have to admit that it dawned on me that I could simply save up only after I already managed to defeat him in the exact way you described: by just buying a bunch of cheap towers in strategic places. It seems counterintuitive that you can just save up money later in the stage because the waves before the boss are pretty easy.

I also manged to immediately do it on veteran difficulty without losing any hearts the first time I actually manged to apply the right strategy. Before that I just lost completely, it was all or nothing. Though if I remember correctly, the first wave of the whole stage is actually the hardest one to not lose a single heart on when you play on veteran difficulty. There was always one pesky tiny critter that managed to sneak through with 1 health unless you were really microing and timing everything to perfection. And if you build better towers to deal with it, the next waves become much harder. After that, it's quite easy once you know how to deal with Umbra's blobs.

[The Fabulous Gravy Train]

Beat him on the first try with lots of crossbows and two necromancers, you'll need barrage on most of your crossbow towers. Once he starts destroying towers, rebuild them as archers.

[BigSilverHotdog]

And don't upgrade the rebuilt archers past lvl 3. Make sure you have lots of money saved before final boss starts. At least 1000.

[Qamok]

Thank all for answer. Indeed archers tower is the key to that boss fight. It's not fun when i repeatedly with success and different strategy defeated first 15 waves just to find out that this is not that one configuration which is effective against the boss.

[BigSilverHotdog]

Yeah, it is pretty annoying. One of the few flaws of the series.

[Osiris]

I think it's the opposite of a flaw, personally. Over the course of KR and KR:F you get so used to spending your money immediately, because that is clearly the best way to win. And then Umbra comes along and tells you that you have become lazy and stubborn in your ways, and demands that you approach the situation differently. It's as if the devs are taunting you, saying "Ha, you think you've got it all figured out, huh?!".

And of course you can beat Umbra with a perfect score without saving up in advance if you just micro your hero furiously, it is just a million times harder to do. It's a bit like cracking a safe instead of simply unlocking it with the code.

[Goodfellow]

All Crossbow Tower