ongo

This fight is all about maximizing Gambit and Rayke windows, so this strategy aims to do that.

Pre-pull:

RUN will be tanking this in 1h axe.  After self-buffing, they can help to Shell 5 the party.
COR starts with wizards, then follows that up with crooked tacticians (you need to hit a 5,
  9, 10, or 11 if COR/RUN are to extend every single skillchain.) Right after pull, you will
  apply miser's roll to yourself and the RUN.
BRD pops Clarion Call and puts up 2 marches, an etude, and 2 ballads.
SCH needs to be conservative with strategems here. You should be pulling Ongo by 13 minutes on
  the clock, meaning you have roughly 4 strategems at your disposal for buffing. Use those on
  AOE Protect 5, AOE+Perp Regen 5, and to get into Addendum: Black. The other buffs to put up
  are adloquium on the RUN and COR, Sandstorm 2 on the SCH and BLM, Klimaform, Animus Minuo
  on the SCH, and Animus Augeo on the BRD.

Pull:
  The goal is to hit 75% in 3 elongated skillchains (6 strategems.) This is roughly 10:30
on the encounter timer. If you're not hitting it there, more than likely gambit/rayke timings
aren't being maximized and/or earth shots aren't hitting the high value spells.
  On pull, the BRD pops SV and Nitro, applies a strong Earth threnody to the boss, re-ups
previous buffs, then Tenuto's themself with 2x mambos and 3x minnes. Once buffs are good,
they can spam Lullabies/Tier 1 threnodies on the boss in an enmity set to try and build
enmity.
  The RUN applies gambit exactly when Gravitation starts, then applies Rayke as soon as
possible afterwards while extending gravitations with Ruinator.
  The COR applies Miser's roll to the COR+RUN while extending Ruinators with Wildfire, and
using Earth Shot on Stone 6's.
  GEO runs Indi-INT + Blaze/EA Geo-Malaise + Entrust Acumen.
  The SCH opens gravitation, applies a nice helix, and nukes liberally. During a typical
skillchain, you can land T5+T4+T3+T5+T2 off of the RUN's darkness and the COR's double darkness.
  The BLM free-casts Stoneja to begin stacking the buff, bursts an Impact off of the first
Gravitation, then bursts as expected. Importantly, the BLM should free-nuke in between skillchains
and continue stacking the -ja buff.

75%:
  BRD begins building enmity on the add.

  SCH pops Tabula Rasa immediately and begins buffing:
    Accession + Perpetuance Sandstorm 2
    Perpetuance Adloquium RUN
    Perpetuance Adloquium COR
    Refresh Klimaform

  Everyone runs into the RUN
    Random deal
    Accession + Perpetuance Embrava
    Accession + Perpetuance Regen 5

  Around this time the bird starts taking damage again, so it's time to Bolster, Rayke, Gambit, get
  another nice Helix up, and start pushing to the lower 40%'s. Do not push it into its 2nd 2-hour yet.
  Even if random deal didn't hit both Rayke and Gambit, things are fine.

  Around the time Tabula Rasa is falling, Ongo should be in the mid-to-lower 40's. You will hold it there,
  within a single skillchain of 40%, until Rayke is 45 seconds from coming back up.

  The COR can use this waiting period as an opportunity to reapply the same 3 rolls.

  With Rayke at 45s, use as few strategems as possible to push Ongo into its second Sforzo. A useful
  strategem saver is True Strike - Immanence Noctohelix.  Both the SCH and BLM should have TP due to
  Tacticians.

40%:
  Everyone except the RUN runs far enough away to SCH SP2 the adds onto the BRD. From that point foward,
  the BRD will kite the adds away from the group.  The BRD needs to find an opportunity in the next ~1.5 minutes
  to reapply a strong Earth Threnody II. If they got JA's back with the first random deal it can be done now.
  If not, they need to do a drive-by during the upcoming Wild Card for JA's, and reapply it then.

  After 30 seconds have elapsed and the group has reassembled 20+ yalms from Ongo, the BLM can pop SP2 and get
  Burn up along with a new Impact.  Be sure to reapply Burn with a couple seconds remaining on SP2.

  With Gambit and Rayke off cooldown naturally, do 3 elongated skillchains, and be sure to apply a new Helix.

  And the end of those skillchains, run in for Wild Card.

  With Gambit and Rayke reset, do 3 more elongated skillchains.

  And the end of those skillchains, run in for Random Deal.

  With Gambit and/or Rayke reset, do 3 more elongated skillchains.

Ongo should be long dead at this point -- likely even before the last random deal. But if it's not and
Wild Card didn't reset any 2-hour abilities, you're likely out of gas. You can abuse True Strike into
Noctohelix to try and eek out a win, or come back and try to clean up execution. Any successful 2-hour
reset from the COR should be a free win, even under unfavorable auras, considering all of the things it
gives you back (more rayke/gambits, random deals, BLM SP2, Bolster, and Tabula Rasa.)

As far as auras go, we countered MAB down with Indi-Acumen, and MACC down can be ignored entirely. Your ability
to ignore MACC down depends entirely on the BRD sticking that buffed Threnody -- so keep an eye on that.  Remember
to reapply Klimaform going into the final push if MACC down was your first aura, as it overwrites it.

Our best win had 4:04 on the clock with room for about 30 seconds of improvement. The GEO helped to nuke
during Rayke/demat, but isn't required.