Lostbelt 7: Nahui Mictlan - Spoiler-free Walkthrough


Introduction
- The spoilers in this walkthrough are limited to what enemies you will face in a particular node.
- Every major boss and Servant encounter is initially hidden. Hover over unknown icons to see what mob/Servant is hidden via its hyperlink.
- Press the New Monster Information or Boss Information headers to see specific spoilers, advice and/or tips.
- Nahui Mictlan is a story heavy experience where many of the encounters are more meaningful through experiencing the story. Try not to rush through it!
- Break Bars are a standard feature once again.
- A full Main Story clear for this section requires 497 AP for Part 1, and ~640 AP for Part 2 (which unlocks at a later date), totaling ~1137 AP.
- Part 1: Prologue - Section 10 (12/25/2024 01:00 PDT ~)
- Part 2: Section 11 - End (1/15/2025 00:00 PDT ~)
- Story length estimates are courtesy of the Atlas Academy DB. The entire story length is estimated to be approximately a 4 hour and 28 minute read for Part 1, and 6 hour and 29 minutes for Part 2 (Total 10h 57m for the entirety of LB7).
- Spotted an error, have a question, or ideas to improve the guide? Feel free to drop a comment in the comments section below!
- Have fun and enjoy the story!
Changelog
Walkthrough - Part 1
Walkthrough - Part 2
Additional Guides
In 17-4 (et al):
It says the debuffs will activate after using MORE than Three skills-- it activates AT three skill uses

Thank you, will update this! Should reflect changes in a few minutes.
Section 10-5:
This battle ends after breaking the boss's first HP Bar, or if the entire party falls.
I put mash, a level 1 servant and a support servant. When I got wiped, it was a game over.
Repeating this. It'd be really nice if we could get a guide for this stage too tbh
Can confirm, that first bar MUST be cleared before you wipe, failing to do so will kick you to the retry screen.
I had the same problem - turns out it's breaking the first HP bar AND then the entire party falls, not "or" the entire party falls. I put in a weak team 2-3 times to let them get wiped asap but couldn't trigger the continuation of the story until breaking the first HP bar and then everyone getting wiped.
St. 5-4: There are actually 2 Sabers (70k-73k HP) and 1 Archer (68k HP).

Thanks! Fixed, it should reflect on the pages within a few minutes.
Interlude 1 is wrong, the field effect only gives the NPC/solo support servant full np gauge on the THIRD turn, not the battle start.
There's also one archer in 5-4 + the two sabers, not three sabers like the guide says, so that's also wrong as well.

Thanks so much! Should update shortly.
After the update to P2, it keeps automarking all of P2 as completed for me (even after ive unchecked them all) :(

Looks like there was a bug in the code, fixing! Should update in a few minutes.
19-4 : Number of enemies actually depend on the number of servants you have in your team (so it can be as low as 3, instead of 6)

Thanks, updated! Will reflect on the page in a few minutes.
Relatively small, but it'd be useful to denote/count the different Raid stages by break bar too (i.e. Raid 1-1, Raid 1-2, etc) somehow
In 22-7 Nemo's portion is wrong (Nemo is a male and his Noble Phantasm is ARTS not buster, seems like whoever wrote the detailed entry copy-pasted Koyanskaya's part of the description)

Thanks for the note! It should be updated within the next few minutes.
Section 3-5 says : -
After 10 turns, she restores all 3 HP bars and her health and any debuffs are recovered.
* Prevented by having a Goddess Metamorphosis Servant.
I clicked on the Metamorphosis Servant link, on the list was Tamamo Caster, so I put her in.
She was in my frontline, at turn 11, I used her skills on my team then attacked, after the attack. The boss restored all 3 HP bars.
I used tamamo and she did prevent her from full healing
I think you have to put her in the front line at the very beginning before battle start
Uh, why is the first battle labeled as "filler"?
Seriously, I've restarted this three times already (First time was calibrated to Filler level difficulty), this is "Hard," or at the bare minimum "Moderate."