Bring a high level reaper king with full imprint and it can do it solo!

Bring an army of megatheriums they'll destroy her into pieces

I think you should take some Spinos with Megatherium and Yuty instead of Rexes because there is water in Broodmother's arena so that Spinos can have their water buff that will help for killing Broodmother fastly.

Breed 2 high level megatheriums and get 18 imprinted megatheriums a daeodon with a lot of prime meat and a high level yuty and STAY ON A MOUNT

When you take on the brood. Rush it. If you get your rexs to surround it you can pin it so it doesnt do its poison attack. Rexs will need 30k hp 800 melle and you will need 10. For Alpha i suggest 85+ saddles 40k hp rexs.

Trap it with a lot of rexes and eat it

Most people use megatheriums,do that with a Yuty and 5 megatheriums, you'll probably be fine

On valguero, there is a cave in which the broodmother can spawn on its own.

So many people.suggesting bring 10 rexes or 12 megas etc.; this is still a boss and you gain no benefits from going in light. You can bring 20 dinos, so bring 20 dinos. Rexes do just fine with mate boosted Yuties buffing. Took barely two minutes on Gamma and Beta.

Other counter-advice; stop worrying about the levels of your dinos and look at their stats; a Level 200 Rex can still have 40k food and crap melee.

“Step on it Arnold, step on it!”

They always said I would never kill the broodmother but I didn't listen but when I tried I immediately died so I advise you to be about lvl 100 something.

If you’re new to the game please read. I’m pretty new to bosses and did not realize how BIG of a difference saddles make. They do a MASSIVE DAMAGE REDUCTION. I mean massive. I’ve lost to the boss twice once with Rexes and once with megatheriums. I have a lot more High level Rex saddles so I’m doing Rexes, but Megatheriums with high saddles are the optimal choice for the fight

Just use rexes leveled from the Megapithecus fight. Way less time consuming that losing your mind attempting to find high level Megatheriums.

THERE IS A WEAK POINT!! SHOOT THE PINK BACK REGION FOR MAX DMG

If for some reason you dont wanna use megatheriuns, spinos are also a great choice, since there is water in the arena, spinos can get the hidration buff for that extra damage.

Brought in 14 megathriums, 4 rexes, a Yutyrannus, 3 Allos and a Daeodon all of which were from level 150-300 but most around 150. Easily beat Gamma with minor tame casualties (2 allos and one lowest level Megatherium)

I just did Alpha singleplayer - entered with 14 Megatherium + 1 yuty for buffing, all basic saddles, no special breeding, just combined HP + att %. I’ve only lost like 4-5 Megatheriums

Today I'm going to do this boss on alpha witch I've never done alpha. Im using an army of 19 mutated megatheriums and 1 not that great yuty but he has good stamina. Wish me luck! And say something if I am missing something and going to fail.

With all the buffs included megatherium get 375% more DMG added and 20% resistance USE THEM!

Use megatherium in substitute for rex