Just use it first. It's okay if they can't break one HP bar of ORT. Just use them one by one. And also, you can use Mash for every 5 fights, so utilize that.

Fun fact: The ORT Raid is limited to just 5 Turns. At turn 5, the ORT will remove and deactivate all our buffs and one shot our servants. So yeah, just focus on dealing damage to ORT.

Just use a single servant per battle with a starting gauge CE and you should easily be able to get enough damage per servant to clear it with your roster.

@Brichards719 @Muhammad Abdul Aziz Habibi Thanks.

Maybe I am just overthinking it.

Don't worry. Happens to everyone. Do your best!

Just hit him as hard as you can. As Aziz suggested use solo runs and hit him as hard as you can.

Safe your hardest hitters for his UFO phases. Those will eat your framerate and you want thoses phases to be dona asap.

Solo it and

Use Anniversary Blonde MC

And CEs with NP Gauge

It's life saver for me when i defeated ORT 3 times from different acc (NA: Main and Sub and JP Main)

Throw your low rarity servants first on Spider form and save your strongest ones for the UFO the ufo is slightly difficult because after your turn it sucks your bit of your HP

And It copies your buff whenever you activate your units atk/strengthening buff

So be careful but i can't remember mostly but Good luck

Sorry this is spam comment of the my comment from top, the send button couldn't work properly.

*Edited

For my low cost strats:

1. Pick whatever servants you have that have Single target NP on it since its deal more damage then AOE type and the one who have NP5 on it (i'm suggesting the 3* and below since they are EZ to get)

2.Leveling your Eggplant aka. Mash since you can deploy her once every 4 turn

3.For CE its situational for my case i'm using the CE : Necromancy (the one who get guts but at 50% chance) , i didn't need to care much if my servants died but have a risk that your servants died because of it but you can use CE that give you stats or battery type .

(remind that every single time you broke ORT Heart he will cleanse your buff "including the guts " and beam you )

4.Always fight with class advantage since the ORT will deal low damage on you and you deal more for it (this is important because when ever he attack you or you deal damage to ORT , he will low your HP %)

5. Good luck

(PS: this is my strats when i'm trying to speed run Main Story to OC4 JP in 11 days using new account , other people might have better starts but this is mine . and i'm using every single thing i had at disposal like Fou , Grail and such to those 3* servants but if you dont want to its fine too )

Remember:

1. Every time you break one HP gauge, the ORT will launch a big attack which is guaranteed to kill ALL your frontline servants.

2. Bring a evasion/invincible master skill set, instead of a stan one. If the enemy attacks and you evaded, you get some NP back.

For every gauge

1. Start with a high levelled servant from the advantage class. The skill levels are not that important in this scenario. Just any Lv90 would do basically. The priority is basically single target attacker > AOE > supportive. For attackers, Kaleidoscope, and launch your noble phantasm as many as possible. For supportive NPs, bring your best invincibility/evasion CE, and make them survive as long as possible. Meanwhile, hit em.

2. Switch the ORT class with Mash.

3. When you feel you can finish this gauge soon, send your low levelled servants from the advantage class instead. So that the high levelers don't go waste.

In this way, actually, you might be able to save your waifu from being predated by the ORT.

Thank you all guys for giving tips.

But ngl this whole second part of LB7 is designed for you to win, it was very easy and I beat all bosses on a first try.

The real highlight in this chapter in terms of difficulty was Camazotz. Beating him using only my servants was a true challenge since I don't have any good DPS for his class.

Fights in LB7 were creative and epic, and I ejoyed them a lot)