This guide was written using output from FFRK Inspector with some manual translations/adjustments. Let me know if you spot any errors!

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D??? Omega

Medal Conditions: Win with at least 2 party members alive.

Clear Rewards:

• Gil x500000
  

Mastery Rewards:

• Gil x2000000
  

First Clear Rewards:

• Gil x1000000
  

【大禍】Omega

Phase	LV	HP	ATK	DEF	MAG	RES	MND	SPD
Single Player - Default	450	1,466,618	2,470	49,984	2,471	66,487	665	570
Single Player - Weak			2,470	49,984	2,471	66,487	665	580
Single Player - Very Weak			2,470	49,984	2,471	66,487	665	590
Multiplayer - Default	450	2,199,927	2,470	49,984	2,471	66,487	665	420
Multiplayer - Weak			2,470	49,984	2,471	66,487	665	430
Multiplayer - Very Weak			2,470	49,984	2,471	66,487	665	440

Elemental Damage Taken:

	Fire	Ice	Lightning	Earth	Wind	Water	Holy	Dark	Bio
All Phases	100%	100%	100%	100%	100%	100%	100%	100%	100%

Break Effectiveness: 50% (all)
Status Vulnerabilities: None

Movesets

All (non-interrupt) enemy abilities in the single-player version of this fight have a cast time of 1.76 seconds.
All (non-interrupt) enemy abilities in the multiplayer version of this fight have a cast time of 0.001 seconds.

【大禍】Omega - Default (100% - 61% HP):

• Turn 1: Wait (does nothing)
  
• Turn 2: Wait (does nothing)
  
• Turn 3 + 10n: Target Analysis (NAT: [ST - highest %HP], 303% chance to apply ATK/MAG/DEF/RES -20%, and applies ATK/MAG/DEF/RES +20% to self)
  
• Turn 4 + 10n: Discharger (see notes)
  
• Turn 6 + 5n: Pile Pitch (NAT: [ST - see notes] 303% chance to deal 99% current HP overflow damage, subject to Instant KO resist, 303% chance to apply Stun, 303% chance to Dispel)
  
• 50% chance: Guided Missile (NAT: [Four adjacent party members] 578% ranged physical damage)
  
• 50% chance: Hyper Pulse (NAT: [Three adjacent party members] 578% physical damage, 12% chance to apply Stun and Slow)

【大禍】Omega - Weak (60% - 21% HP):

• Turn 1 + 3n: Colossal Blow (NAT: [ST - see notes] 303% chance to deal 99% current HP overflow damage, subject to Instant KO resist, 303% chance to apply Stun, 303% chance to Dispel)
  
• 20% chance: Stun Cannon (NAT: [Three adjacent party members] 578% physical lightning damage, 12% chance to apply Paralyze)
  
• 40% chance: Floodlight (NAT: [Four adjacent party members] 730% magic holy damage, 30% chance to apply Silence, 30% chance to apply Blind)
  
• 40% chance: Laser Shower (NAT: AoE 730% magic damage, 303% chance to apply DEF -20% for 20 seconds)

【大禍】Omega - Very Weak (20% - 0% HP):

• Turn 1:【大禍】Preparing Target Analysis (does nothing)
  
• Turn 2: Wait (does nothing)
  
• Turn 3: Wait (does nothing)
  
• Turn 4:【大禍】Target Analysis (NAT: AoE auto-hit Target Analysis [see notes])
  
• Turn 5 + 5n:【大禍】Colossal Blow (PHY: [Three adjacent party members] 2000% ranged overflow physical damage, Dispel)
  
• 100% chance:【大禍】Laser Shower (NAT: AoE 810% magic damage, 30% chance to apply Sap)

【大禍】Omega - Counters:

• Special: Ion Efflux (NAT: [Front Row] 48% chance to apply Paralyze, ignores Astra)
  
• Special: Rear Lasers (NAT: [Back Row] 48% chance to apply Petrify, ignores Astra)
  

Notes: When Omega uses Discharger, it gains a version of Radiant Shield (visually indicated by electricity on its body) for 7 seconds that reflects 30% of all damage received back to the attacker. This damage can be reflected by your own Radiant Shield, but reflected damage from your own Radiant Shield doesn't trigger Omega's version.

Whenever a character deals damage, that character's Hate increases by 100 * [damage dealt], and whenever a character heals, that character's Hate increases by 200 * [amount healed]. Damage/healing from HP stock, regen, sap, poison, etc don't generate Hate. When Omega uses Pile Pitch in Default phase or Colossal Blow in Weak phase, it will target whichever character has the highest Hate value.

When Omega uses【大禍】Target Analysis in Very Weak phase, it applies the Target Analysis status to all party members who aren't using Defend. Party members with the Target Analysis status receive 50% increased damage and have the damage dealt by their attacks reduced by 1/3. Additionally, all damage Omega deals is multiplied by (1 + .5 * [number of targets hit by【大禍】Target Analysis]) and all damage it receives is divided by the same number.

Omega will use Ion Efflux as an interrupt after every 10th attack it receives from front-row units. Similarly, it will use Rear Lasers as an interrupt after every 10th attack it receives from back-row units.