An Idiot's Guide to Seymour Flux - "Yuna Gonna Buff" Edition

Guide/Analysis

Yep... I'm late... ;-;

As compensation, here's 3 facts (more like an opinion and 2 facts) about U Seymour Flux!

This is the second FF10 U boss in a row to appear after a humanoid FF5 boss.
So far, all two of the FF10 U bosses have an annoying gimmick. Bleh. They both have a 3 fixed attacks in the battle. And both target scores require you to defeat them before they use the third fixed attack.
Both U Yunalesca and U Seymour ~~Fucks~~ Flux has the same stressful battle music, Challenge. Still a brilliant masterpiece, though.

That enough compensation? :P

Btw, Edition is brought to you by the Gold medalist for the Maduin Challenge, u/Xinde! 'Grats to him! :D

Stat Overview

Boss	Seymour Flux (Ultimate)
HP	~247000
Elemental Weaknesses	None
Elemental Resists	None
Elemental Immunities	None
Break Resistances	All
Break Immunities	None
Status Vulnerabilites	Poison, Sap

Boss	Mortiochis
HP	~27400
Elemental Weaknesses	None
Elemental Resists	None
Elemental Immunities	None
Break Resistances	All
Break Immunities	None
Status Vulnerabilites	Slow

Target Scores:

Defeat Seymour Flux before he uses Dispel (Ultimate) thrice
Afflict Seymour Flux with Poison or Sap
Afflict Mortiochis with Slow

Movepool:

Seymour Flux and Mortiochis gets stronger attacks (and a new movepool) at certain points of the battle, depending on the current HP of Seymour Flux.

Seymour Flux - Normal (76-100%):

Attack: Deals one physical attack to one target. Same old. Same old.
Lance of Atrophy: Deals one physical attack to one target. Seems to do a little bit more damage than the regular attack. Still very weak, though.

Seymour Flux - 75% Interrupt:

Dispel (Ultimate): Aaaand it's back.... For those who don't know, this is AoE Dispel that gets rid of every buff in the game, including buffs like Wall and HotE. As he's pretty weak in his first phase, I recommend just not using your Wall or mitigation RW/SB during this first phase. I would advise using Protectga, though. He's weak, but entirely physical in this phase.

Seymour Flux - Weak (51-75%)

Gravija: Deals heavy proportional damage to all targets, based on current HP. This hurts. Nyuk, nyuk, nyuk. (Oh, wrong boss?)
Lance of Atrophy: Deals one physical attack to one target. Same as before. Aka, weak sauce.
Multi Fira/Blizzara/Thundara/Watera: Deals magical damage twice to one target. Element is based on the name. This will mainly be a constant threat due to Seymour's nasty Gravijas. Be sure to keep your magical mitigation updated at all times.
Firaga/Blizzaga/Thundaga/Waterga: Deals heavy magical damage to all targets. Element is based on the name. Your biggest worry is that he uses this right after a Gravija. Keep your HP high at all times.

Seymour Flux - 50% Interrupt

Dispel (Ultimate): Yes, he uses this again. What a pure unadulterated bullshit move made by DeNA. I hate you too.

Seymour Flux - Very Weak (0-50%)

Same moves as his weak form, minus the Ga spells.
Reflect: Gives Reflect to self. Won't use if Seymour already has Reflect. You should be familiar to Seymour's Flare+Reflect tactic by now. Like always, Dispelling the Reflect can always give you a nice edge in damage, especially if you're bringing Banishing Strike as a source of damage for one of your knights.
Flare: Deals heavy non-elemental magical damage to self. Hurts, but it's overall not too bad. Gravija and Total Annihilation is the main killer here.
Dispel (Ultimate): This is similar to Yunalesca's AoE Holy and Beatrix's third Climhazzard; He uses it after a certain amount of turns (which is very, very long). Shouldn't worry about this too much, as you'll either beaten the battle and have died trying long before this is unleashed.

Mortiochis - Seymour Flux is at Normal

Cross Cleave: Deals heavy physical damage to all targets. This is going to be the most amount of damage you'll take in his first phase. Still, not too bad.
Attack: Deals physical damage to one target. Chance of dealing an additional attack. A meh attack.
Mortibsorption: Deals 9999 damage to Seymour Flux, while healing Mortiochis for 9999. He only uses this if you dropped his HP to 0. Bring some nice AoE attacks to exploit this.

Mortiochis - Seymour Flux is not at Normal

Same moves as his normal form, only that Attack guarantees an additional attack.
Total Annihilation: Deal heavy magical non-elemental damage to all targets. Ouch.

Percentages are rough estimations. Will update once AI is datamined.

Analysis:

What's with FF10 and annoying U bosses with annoying gimmicks? Anyways, the main things here is his 2 U Dispels, Gravija, and Total Annihilation. Besides the annoying U Dispels, this is basically another battle of attrition. Kill before you get killed. You will need some RW timing, though, if you're bringing a mitigation SB, due to his early U Dispel.

Teambuilding

RW selection:

Usual RW selection here. Note that Heroic Harmony bypasses the U Dispels at the cost of less mitigation! Decide whether a Wall or HH will be best for you!

SG=SS2=Heroic Harmony>Hastega>Medicas

Abilites:

Very typical recommended ability suggestions. Any abilities that Slow, Poison, or Sap will be needed to fulfill the Target Scores. Breakdowns or Dances are very important here as most of you will be running a part of the battle without all your mitigation. AoEs can be used to manipulate Mortibsorption. Do note that you can Tauntaliate (Retaliate + Draw Fire) the first Phase as the majority of the attacks are single target physical attacks.

RMs:

Once again, very standard. The only thing I would really say is that RES reducing RWs are discouraged due to Seymour's occasional Ra/Ga splurges.

Remember to remove your "ability spring" RMs (Concentration, Moon's Grace etc.). They literally do nothing in battles with one level besides wasting a RM slot on your characters.

Recommended Team:

Any team (besides Advantaliate, due to the 2 U Dispels) can work here. Most people nowadays, however, will prefer a physical team. Consider bringing a second White Mage! This is due to Gravija's heavy damage.

Basic Battle Strategies:

I would recommend bringing Dances (Breakdowns will work, too, but lacks the AoE convenience) for this battle. In the beginning, I would hold off from using my buffing SB/RW since he's pretty weak during the first phase (think U Maduin's physical stages). Once he uses his first U Dispel, I'd unleash my SBs and start mauling him to death. After the first U Dispel, it's essentially a battle of attrition; he has massively damaging attacks and you (should) as well. Just don't forget to reapply buffs after the second U Dispel!

Good luck! がんばろう!

Final Thoughts:

JP players infamously had trouble with this battle, mainly due to Seymour Flux's massive damage potential (cough Gravija cough) and his double U Dispels. Just bring enough mitigation to survive the first phase and just spam everything on the second. You should have built up your SB gauges by the time he uses his second U Dispel.

Thanks to the Discord Chat (/u/sorryidontexist, u/KnoxZone, u/CornCaramel, and u/theSFaction) for proofreading the guide! I would like to thank u/fattybomchacha for all the information on Seymour Flux (and Mortiochis)'s stats and movepool! Be sure to check kongbakpao's website for guides on all events! :D

An Idiot's Challenge

The top five people who completes the challenge will get to be on the Idiot's Hall of Fame, which will be located in my An Idiot's Collection to An Idiot's Guides. In addition, the first person who beats it will be able to name the Edition of my next guide (must be approved by me)!

Rules:

You must provide complete video footage of the battle through Reddit's Private Message service, with the setup at the very end. Message topic must be in the following format: [An Idiot's Challenge - (name of challenge) - (Reddit name)]. No fancy movie magic (modifying the video)! Failing this rule will lead to an automatic disqualification!
You must fulfill the challenge requirements. Failing this rule will lead to an automatic disqualification! Attempting to plagiarize someone's completion of this challenge will lead to an automatic disqualification and a one-way sentence to the Challenge Blacklist!
You do not have to master the battle, unless it is a part of the challenge.
You are allowed to use Phoenix Down bonuses (Mythril revives).

This challenge is called "Under the Yevonite Laws"!

Complete the battle with at least 12 medals!
You may not attack Seymour Flux (Ultimate) with any attack, ability, SB, SSB, RW, or Burst command. This includes non-damaging attacks, such as Dances!
You may not damage Seymour Flux in any way, besides from Mortibsorption.
You may only bring FF10 synergy characters and Core characters!

Maduin Challenge - "The Kefkesque Metamorphosis" Results

[Gold] - u/JuicymamaBH
[Silver] - u/Omnislash88
[Bronze] - u/Xinde

Congrats to all! :D

An Idiot's Collection to an Idiot's Guides

Posted Feb 24, 2016, 12:43 AM UTC · edited

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