Dirac - Quantum Waltz is a stigmata set added in v3.2. Dirac's main strength revolves around the middle piece, which gives high Total Damage Multiplier (TDM) for Burst Mode battlesuits. Currently, Dirac can only be obtained from gacha.
TOP: Gives up to 20% crit rate.
MID: Gives up to 65.5% TDM for valkyries with Burst Mode. One of the best and versatile stigmata in the game.
BOT: Recovers sp over time after Ultimate Evasion. Also gives 20% Physical DMG.
2SET: Resets and extends duration of stigmata effects. Also gives 35% Physical DMG.
3SET: Resets and extends duration of stigmata effects. Also impairs enemies.
20% Crit Rate is nice for physical dps, but it is not worth using alone over TDM or Physical DMG stigmata. Instead, Dirac T is best paired with Dirac M for the set effect.
Image shows icon for Dirac T buff.
Dirac M is one of the best stigmata in the game. It provides up to 65.5% TDM for Burst Mode battlesuits.
There are three parts of Dirac M:
Example 1: If Night Squire uses Ultimate, she will get all three buffs during Burst Mode.
Example 2: If Hawk of the Fog uses Ultimate, the ultimate attack will get 26% TDM. Afterwards, she will get the TDM increase over time. Her Basic ATK will only benefit from this buff.
Image shows icon for Dirac M TDM increase over 10s. As you can see, both Night Squire (burst mode) and Hawk of the Fog (not burst mode) can activate this particular component of Dirac M.
 Unrestricted 20% Physical DMG is nice on physical dmg dealers.
 Impressive SP recovery that will help you get ultimate faster.
 Recover up to 13.5 SP over 10s duration. This is almost as much SP recovery from Schrodinger Band.
 Can be used on its own or with Dirac M for set effect.
Image shows sp recovery icon for Dirac B, and 13.5 sp increase with Dirac B.
 Resets and extends duration of individual piece effect to 14s, which means the powerful Dirac M effect will now last longer. Perfect for valkyries with long burst duration, such as Swallowtail Phantasm.
 Provides 35% Physical DMG. Depending on which combination you use, you will get crit rate (TM) or more physical dmg and sp recovery (MB). Both are good bonuses for physical dmg dealers.
 Dirac TM
 Dirac MB
 Dirac TB
Example of Dirac 2-pc set effect
 3-pc set effect extends the stigmata buffs even longer, up to 18s long. This isn't really needed as only SP and BK Burst Modes last this long, and 14s duration extension is already long enough for SP.
 In other words, you use Dirac full set for the strong single piece and 2-pc effects. Just consider the 3-pc effect as a bonus.
 Impair can be useful if you don't have other reliable impair source such as Celestial Hymn or Briareus EX, or after support impair expires.
Example of Dirac 3-pc set effect
 Dirac M can be used by any Burst Mode battlesuits.
 Dirac M and its set combination is more suitable for Physical Burst Mode battlesuits.
 Dirac B can be used on its own for its SP recovery effect.
NOTE: Some valkyries have non-burst mode attacks during Burst Mode, so they can't fully enjoy Dirac M bonus. Perhaps we'll discuss this in another guide.
Since there's a lot of capable users, let's see its endgame applications:
 SP vs RL Tonatiuh [YOUTUBE]
 SP vs RL Death Web + Gigant [YOUTUBE]
 SK vs RL Double Wendy (Dirac M) [YOUTUBE]
 SK vs EX AKA (Dirac M) [YOUTUBE]
 HoR vs RL HoV Dirac Sea (Dirac M) [YOUTUBE]
 It's so strong even WC can get 30k vs EX Tonatiuh [YOUTUBE]
SHOULD YOU PULL DIRAC
Overall, Dirac is a strong stigmata set for battlesuits with Burst Mode. However, currently Dirac is only obtainable from gacha. So you have to ask yourself if it's worth your hard-earned crystal.
ASK YOURSELF THESE QUESTIONS
If most of your answers are YES, then you may consider pulling Dirac from supply.
Overall, Dirac is a very powerful stigmata set for battlesuits with Burst Mode. Dirac M is the most important piece while Dirac B can be used for SP recovery.
It is recommended to pull Dirac from gacha if you plan to get max potential on Night Squire, Swallowtail Phantasm, and to an extension, make your Burst Mode valkyries much stronger.