Persona 3 Portable - Secret Boss Elizabeth (No Commentary)

Since I really like Persona 3 and my plans to LP it kinda fell through, I figured I might as well shows one of my favorite fights from the game. If people like it I might do another video where I explain how to prepare for it and do a live commentary of the fight.
Elizabeth can be fought on a New Game + file on the 10th floor of the optional Tartarus block Monad. Having Orpheus Telos is pretty much a must. You can fuse him if you have the Colorless Mask which is received from Igor after completing all social links. You want his stats to be maxed out as well. Part of that for me comes from the fact that I have my ultimate weapon equipped which boosts all stats by 10 although you could also boost his stats up to max without it. You should also be level 99 so your HP and SP are both at 999.
To get Orpheus Telos an easy way to go about it is to fuse Odin + Scathach + Nidhogger. You want Odin's Thunder Reign skill to be passed down. It will be your primary source of damage. This is the only skill you need to pass down. The other skills can be gotten from skills cards obtained from the following Personas:
Sharp Student (Zouchouten)
Will reduce the chances of Elizabeth getting critical hits on us.
Mind Charge (Atropos)
Makes Thunder Reign do 2x damage after charging. (Some sources claim 2.5 like it is in most other MegaTen games but in Persona 3 it should only be 2x)
Salvation (Vishnu)
Used to fully heal as well as remove the poison status that Nebiros can inflict.
High Counter (Siegfried)
Used to counter Elizabeth's physical attacks at a 50% chance.
Elec Amp (Odin)
Elec Boost (Take-mikazuchi)
Used to boost the damage of Thunder Reign.
Unshaken Will (Asura)
Nullifies all status ailments except for poison.
To get these skill cards the skill Growth 3 is recommended and can be obtained as a skill card from Jatayu.
As far as equipment goes, any weapon will do. If you do want the ultimate weapon you can fuse either Lucifer for the male MC or Kartikeya for the female MC with any nihil item dropped from gold shadows. The Armor of Light can be gotten from Messiah as a heart item at a random chance. It's not required but it does have the best defense in the game and also reduces magic damage. Lastly you absolutely want the Divine Pillar as it reduces all damage taken by half. It can be obtained as a heart item from Alilat.
You also need a few items, most importantly a bunch of Infinity and one Armageddon. Infinity x 10 can be gotten from the Fortune & Strength door in Vision Quest, as can Armageddon from the Hanged Man door. Do note though that you need to let the Hanged Man prime a Maya and cause an explosion, otherwise you will get a Victory Cry skill card instead. You also want a few Homunculus to protect against instant death.
I also use a Persona that applies all buffs at the start of the fight. You don't need this but every little bit helps.
Now as for the fight itself... Elizabeth cycles through different Personas in a set order. With the exception of Masakado she will attack twice and use either that Persona's skills or a physical attack.
Surt - Fire
Jack Frost - Ice
Thor - Electricity
Cu Chulainn - Wind
Metatron - Light
Alice - Dark
Nebiros - Status ailments
Masakado - Megidolaon
After she has used a Persona its elemental affinities apply. Note that even if you don't see a Persona because she physically attacks twice she has switched to it anyway.
Surt, Jack Frost and Cu Chulainn are all susceptible to Thunder Reign and you usually want to Mind Charge before using it. Thor and Metatron can be hit with physical attacks though you should only do it if you don't need to heal or use Mind Charge that turn. Alice and Masakado are pretty much immune to all damage. Nebiros won't pose a problem since Unshaken Will makes us immune to pretty much anything it can do. However, after she uses Nebiros you MUST use Infinity as Masakado will use Megidolaon. Elizabeth's Megidolaon is special in that it always does 9999 damage which will instantly kill you. After Masakado she cycles back to Surt.
A few rules of engagement:
1. You can NEVER block the element Elizabeth is about to use. Doing so will cause her 9999 damage Megidolaon instead. Orpheus Telos comes in handy here as it is strong against everything but doesn't block anything.
2. Elizabeth has 20000 HP If you push her under 10000 HP she will fully heal.
3. If you push her under 4000-5000 HP she will spam Megidolaon every turn (this is why we need Armageddon).
4. After 10 cycles she will start spamming Megidolaon so this is the hard turn limit.
5. You can't spam Armageddon from the start. Doing so will cause her to spam Megidolaon.
The goal is to get her as close to 10000 HP as possible. After which she need to push herself under 10000 by getting countered. This counter needs to be the second attack because otherwise her second move will be healing herself anyway. When she gets below 10000 the fight can be ended by using Armageddon.
Hope you enjoyed this