Encounter Advice 5.35

FFXIV Shadowbringers Summoner: The Unending Coil of Bahamut (UCoB)

Authors

Elevation Xx
Elevation Xx Contributor | NA | Gilgamesh

The Unending Coil of Bahamut (Ultimate)

UCoB
UCoB

Before You Begin

Disclaimer

This guide attempts to cover the common timings that the vast majority of groups will see, however, in very extreme situations of enrage timings on the earlier phases, or pushing for Rank 1 speed, the contents of this guide may not be suitable.

The images shown throughout are used as example sequences. In practice, such sequences could differ on both a micro or macro level due to extreme differences in push timings.

Alongside this, the depiction of Swiftcast usage throughout this guide prioritises damage optimisation, assuming reclear environments. For players using this guide during progression, I recommend holding Swiftcast for potential raise opportunities, as the utility of caster raise is extremely valuable.

5.x Build Options

Coming Soon(tm)

General Fight Tips

Egi Assault II

Due to being synced to Level 70 we will not have access to the “Enhanced Egi Assault” trait that provides the additional Ruin IV procs from Egi Assault II.

We will always hold our Egi Assault II charges for oGCD weaving or movement purposes regardless of drifting its cooldown.

Phase 1: Twintania

Twintania
Twintania

Phase 1: 3rd GCD DWT Opener

3rd GCD DWT Opener
3rd GCD DWT Opener

The above sequence is the current standardised opening rotation for Level 70 Summoner. Similar to the Level 80 openers, we’ll be doing a 3rd GCD DWT timing, however we can use the full duration of this DWT as we won’t have our Bahamut Phase until our 2nd DWT timing is finished.

Phase 1: Filler Phase #1

Once our opener DWT is finished, we’ll begin the first of two “filler” phases during Twintania. During this rotation downtime, our priority is just to cast as many Ruin 3s as possible, and avoid any unnecessary Ruin 2s.

Phase 1: 1st Hatch + 2nd Liquid Hell Bait

The first mechanic that we’ll encounter during our filler phase will be the 1st Hatch spawn + the 2nd Liquid Hell bait. Due to the Hatch randomly spawning on any DPS player, this means we should be prepared for either being targeted for the 1st Hatch, or having to bait the 2nd set of Liquid Hell in the event the phys ranged DPS is targeted instead.

Phase 1: 1st Hatch Example

1st Hatch
1st Hatch

If we are targeted for the 1st Hatch, we can simply slidecast our way to the Neurolink during our hardcast Ruin IIIs, and then use Egi Assault 2 charges for moving inside and resolving the Hatch. Due to the pet no longer gaining the Neurolink damage reduction debuff, Egi Assaults are ideal during Neurolinks as the pet damage will not be reduced

Phase 1: 2nd Liquid Hell Example

2nd Liquid Hell
2nd Liquid Hell

If we are required to bait the 2nd set of Liquid Hell AoEs alongside the first hatch, we can follow the sequence above to remove the risk of using Ruin 2 for a potency loss.

Phase 1: Rotation Cycle

Rotation Cycle
Rotation Cycle

As Twintania is a shortened phase lasting less than 3 minutes for the vast majority of groups, our rotation cycle should follow the outline presented above. You will likely only see 3 trance timings in total during this phase, with our DoT alignment created to limit the amount of hardcast sets of DoTs that will be required.

Phase 1: 2nd DWT & Bahamut - 2nd Hatches

2nd DWT + Bahamut
2nd DWT + Bahamut

Depending on possible mechanic skips at the beginning of Twintania, your 2nd DWT may align itself during the 2nd set of Hatches + Twister combo. If you are targeted with Hatch and your DWT aligns as such, it is best to use the full duration of this DWT to utilise Egi Assaults during the neurolink debuff, avoiding any potency loss.

Phase 1: Addle Mitigation

Addle in this phase will be used to mitigate the Fireball stacks from Twintania.

While you should discuss with your healers which should be Addled, common ones to Addle are the second Fireball before the first Neurolink drop if it is not skipped, and the Fireball during random Liquid Hell baits after the second Neurolink drop.

Note: Do not use Addle on the first Fireball if your group is LB cheesing for extra easy LB gauge

Phase 2: Nael van Darnus

Nael Van Darnus
Nael Van Darnus

As you begin Phase 2, your reopener sequence may differ depending on your exact push timing during Twintania. While common push timings will typically be in the 2:20-2:30 range, with the actual downtime taking an additional 26 seconds, you may also see push timings as early as 2:05-2:10 or as late as 2:40-2:50. Therefore, your reopener priorities will differ based on how push timings will affect both your personal rotation alignment as well as party burst alignment.

Phase 2: Reopeners

Phase 2: Delayed Burst Reopener

Delayed Burst Reopener
Delayed Burst Reopener

With this first example, we have a reopener sequence where raid buffs and our next burst phase will end up delayed slightly into Nael’s timeline due to a fast kill time on Twintania. To compensate for this delay, your reopener should prioritise these conditions:

  1. Opt for a full DWT duration. This will ensure that you’re able to use Devotion at the appropriate time, aligning it for any 60s or 180s buffs your party may have. This will also place your Deathflare + Bahamut to overlap this buff window, maximizing potential damage gains.

  2. Hold your initial Aetherflow stacks to align your Festers for raid buffs. Common push timings should allow you to do this without delaying your next Energy Drain usage, therefore it will be a direct damage gain to hold your stacks by several GCDs to align for party buffs.

Phase 2: Fast Burst Reopener

Delayed Burst Reopener
Delayed Burst Reopener

With this second example, we have a reopener sequence where raid buffs and our following burst phase will occur immediately upon this phase beginning. To accommodate this accelerated buff timing, our rotation priorities can be changed:

  1. Use a shortened DWT duration. This will ensure that you’re able to fit your Deathflare and as much Bahamut potency as possible into your raid buff window.

  2. Use your Tri-Disaster reset to clip your DoTs. This is a specific choice to this timeline as clipping your DoTs into buffs will help you maintain proper alignment when raid buffs are not delayed like the other scenario.

Phase 2: Rotation Cycles

Due to the potential difference in our reopener timings, our rotation cycle during this phase may be altered to adjust for these differences.

Like Twintania, Nael is also a shortened phase which will commonly last less than 3 minutes in total, therefore we will prioritise alignments which minimise the need to hardcast DoTs while still prioritising raid buff timings and general rotation principles.

Phase 2: Rotation Cycle - Delayed Burst Reopener

Delayed Burst Reopener Cycle
Delayed Burst Reopener Cycle

Our first example will show our rotation cycle to accommodate for delayed burst timings, assuming a faster Twintania kill time. As raid buffs will likely be delayed relative to Nael’s timeline, we will opt to utilise 0 - 30 - 60 alignment on our DoTs, while pushing for strict 55 second Trance timings.

Phase 2: Rotation Cycle - Fast Burst Reopener

Fast Burst Reopener Cycle
Fast Burst Reopener Cycle

Our second example will show our rotation cycle to accommodate for immediate burst timings assuming a slower Twintania kill time.

As raid buffs will be used immediately in this scenario we will opt to clip our DoTs in the reopener and delay our next DWT by 5 seconds to not overwrite our Tri-Disaster cooldown.

Phase 2: Finishing Nael - Push Timing To Phase 3

As both rotation alignments will see your Bahamut used at the very beginning of Nael, with 2 additional DWT timings thereafter, your push timing during this phase will dictate how you should prioritise your next Bahamut usage.

If your expected kill time during Nael is slow enough that you will see the final set of RP mechanics before Nael dies, then you should use your 2nd Bahamut before Nael dies.

If your kill time during Nael will be fast enough that this final RP mechanic is skipped entirely, or Nael’s HP will hit 0 as she begins casting the first mechanic, then this Bahamut should be held for the Bahamut Prime reopener.

Phase 2: Addle Mitigation

During this phase you will have multiple opportunities to use Addle to help mitigate for Thermionic Beam that Nael will cast throughout this encounter.

Do your best to communicate with your party with specific timings that your healers may want this mitigation to be used or be aware of party mitigation used elsewhere and try to make good judgment calls for where Addle would be more valuable.

Phase 3: Bahamut Prime

Bahamut Prime
Bahamut Prime

Our reopener upon reaching this phase will heavily depend on the earlier push timings, and whether you are able to skip the final set of Nael RP mechanics or not. Based on that timing, our initial rotation alignment for both the reopener itself, as well as the uptime following the Quickmarch Trio, can change.

Phase 3: Initial Alignment

Phase 3: Slow Nael Kill Alignment

Slow Nael Kill Alignment
Slow Nael Kill Alignment

With this first example, we show how your initial rotation alignment will look if subjected to slower push timings.

Our initial opener will be nothing more than casting GCDs and using our next Dreadwyrm Trance as it becomes available, with a continued filler phase after the Quickmarch Trio finishes.

Phase 3: Fast Nael Kill Alignment

Fast Nael Kill Alignment
Fast Nael Kill Alignment

With this second example, we show how your initial rotation alignment will look if your push timing from Nael is much faster (skipping final Nael quote).

As such a push timing will generally force you to hold Bahamut, our opener on Bahamut Prime will consist of that held Bahamut + our next Dreadwyrm Trance usage with Deathflare weaved immediately. We may also be able to enter this opener with 2 aetherflow stacks held, allowing us to align a 4x Fester sequence in this opener as well.

Phase 3: Post-Blackfire Trio

Upon finishing the Blackfire Trio, your rotation alignment from this point onward should generally remain consistent (on a macro level) with most common push timings. This means, regardless of whether you begin with the DWT opener sequence, or Bahamut being held for Bahamut Prime, our rotation alignment will no longer differ by this next uptime window, excluding extremely rare cases of enrage kills on both of the earlier phases.

Post-Blackfire Trio
Post-Blackfire Trio

Our post-Blackfire sequence should include our next Dreadwyrm Trance + Bahamut timings, alongside our Devotion timing (which is optimal to be used here alongside any other 60s/120s/180s buffs).

Be sure to prioritise your 2nd Tri-Disaster and both Fester casts for raid buffs.

Phase 3: Post-Fellruin Trio

Our next uptime window will be following the Fellruin Trio.

Post-Fellruin Trio
Post-Fellruin Trio

The example sequence shown above shows our next Dreadwyrm Trance timing will take place during this window, while we will also begin with 2 aetherflow stacks held for another 4x Fester alignment.

We will also prioritise a triple weave with Tri-Disaster -> DWT -> Tri-Disaster. By doing this, we are able to put Tri-Disaster on cooldown slightly earlier, allowing us to weave our next Tri-D cooldown a GCD earlier in the next uptime phase.

Phase 3: Post-Heavensfall Trio

Our next uptime window will be following the Heavensfall Trio.

Post-Heavensfall Trio
Post-Heavensfall Trio

The example sequence shown above shows our next Dreadwyrm Trance + Bahamut timing should take place during this window. We also once again show a triple weave to push our Bahamut ahead by a GCD, allowing us to make small damage gains in relation to raid buff alignment.

Phase 3: Post-Tenstrike Trio

Our next and final uptime window during this phase will be following the Tenstrike Trio.

Post-Tenstrike Trio
Post-Tenstrike Trio

The example sequence shown above shows our next Dreadwyrm Trance timing should take place during this window, and will finish off this phase casting GCDs and weaving our next Energy Drain to conserve stacks for the Phase 4 reopener.

Phase 3: Sacrificing DWT - Grand Octet

During the Grand Octet Trio mechanic your ideal play will be to activate your next DWT cooldown ASAP and sack it during the down time. Doing so will provide you with your 2nd Dreadwyrm Aether allowing you to begin Phase 4 with your Bahamut ready to go, and your next DWT which will follow soon after. The benefit to doing this is you will be able to create a rotation cycle during Phase 4 to gain an extra Bahamut usage before the transition to Golden Bahamut.

Phase 3: Addle Mitigation

Addle in this phase will be used to mitigate the raid-wide damage from Gigaflare. After every Trio, Bahamut will cast a Gigaflare, and a total of two (per caster) can be Addled throughout the phase. You should discuss with your healers which of these raidwides they want to be mitigated with Addle. Your second Addle usage will depend on your first one.

If your first Addle is on the Gigaflare after:

  • Blackfire Trio, you can choose between the Gigaflare after either Heavensfall Trio or Tenstrike Trio for your second Addle
  • Fellruin Trio, your second must be on the Gigaflare after Tenstrike Trio

Phase 4: Adds Phase (Twintania + Nael)

Adds
Adds

Phase 4: Adds Phase Opener

Adds Phase Opener
Adds Phase Opener

Once Twintania and Nael are targetable, you should aim to execute a reopener sequence as the image above depicts. Our goal is to use early GCDs on Egi Assault 2 from Titan-Egi, for both higher damage gains on 2 targets, and also providing the necessary weaving space for getting DoTs on both targets and our Devotion timing.

Phase 4: Egi Priority

As this phase will generally provide 2 target uptime for AoE opportunities, a small optimisation that can be made is swapping pets to utilize their AoE capabilities with Egi Assault 2 usage.

Adds Phase Egi Priority
Adds Phase Egi Priority

With this information, we know that Mountain Buster maintains a flat 250 pet potency on any target within range of its cast, while Flaming Crush has a 50% damage reduction on any additional targets. Because of this, properly timing Titan-Egi swaps for Mountain Buster use will always be a potency gain, assuming both Twintania and Nael are within range.

Phase 4: Rotation Cycle

Adds Phase Rotation Cycle
Adds Phase Rotation Cycle

With our priority around setting up a Bahamut reopener for the start of this phase, our remaining rotation cycle should follow a timeline as shown above.

As this phase will generally only last over the course of 2 minutes or a few more seconds after, you should prioritize using both of your DWT cooldowns ASAP to set up your 2nd Bahamut usage before the bosses are dead. Aside from this, continue to follow general priorities around GCD usage, as well as DoT uptime on 2 targets to maximize your damage output.

After finishing the Grand Octet mechanic, you will move into the 4th phase of the encounter where you will fight both Twintania and Nael together. As both bosses will be targetable throughout the entirety of this phase, our rotation will prioritise multi-target potency gains.

Phase 4: Addle Mitigation

Addle in this phase will be used on one of the Megaflare casts from Nael.

It is generally advised to Addle the first Megaflare cast as Addling the second one may cause you to not have Addle back in time for the first Morn Afah in Golden Bahamut.

Phase 5: Golden Bahamut

Golden Bahamut
Golden Bahamut

Due to the prolonged transition which will kill everyone in the party to Teraflare, only to be resurrected, our rotation timeline for this final phase will be completely reset. This means that our rotation timeline during this phase will always be consistent.

Phase 5: Opener

Golden Bahamut Opener Example
Golden Bahamut Opener Example

Our opener for this phase can be adjusted in multiple ways to accommodate the use of addle, as well as altering our oGCD timings based on kill time specifics.

Phase 5: Opener Addle

The use of Addle in our opener is for mitigating Morn Afah casts. If your party requests you to Addle for the 1st Morn Afah (and subsequently, the 3rd and 5th Morn Afahs), then Addle must be weaved in the 1st GCD slot immediately to ensure proper alignment later on.

Phase 5: Opener Devotion

Devotion alignment will depend on your group’s expected kill time. For the majority of cases, it is likely that prog groups will still experience kill times nearing enrage, therefore Devotion can be used in the opener to ensure a 2nd usage for your final burst at the end.

However, for more optimised scenarios where your final kill time is significantly faster, Devotion can be held (alongside any other 3 minute cooldowns) until your final burst with potions.

Phase 5: Rotation Cycle

Following the opener, our rotation timeline can be chosen based on what we expect our final kill time to be. Due to the changes with Patch 5.1, we are now able to “accelerate” our trance timings, allowing us to shorten our rotation loops slightly to better adjust for faster kills. Therefore we will have the options of both accelerated and delayed timings.

Phase 5: Faster Kill Timeline (Ahead Of Enrage)

Faster Kill Timeline (Ahead of Enrage)
Faster Kill Timeline (Ahead of Enrage)

The example above shows what your rotation alignment should look like if you are anticipating faster kill times ahead of the enrage cast. This means we are aiming to accelerate our final trance timings to push our 2nd bahamut earlier, allowing us to still perform a proper final burst.

It’s important to note that with this specific timeline, we will activate our 2nd DWT timing as a ~60 second timing instead of a “rushed” 55 second timing. This is to ensure we maintain the proper DoT alignment laid out above, as our goal is to gain a 7th Tri-Disaster usage.

Phase 5: Slower Kill

Slower Kill Timeline (Enrage)
Slower Kill Timeline (Enrage)

This example showcases rotation alignment for a slow kill time that will reach the enrage cast. As such a kill time would result in roughly a 3:30 total duration or a few seconds longer, this means we can re-align our trance timings to keep our DoTs and Trance/Demi-Summon actions for all possible 60s and 120s raid buff windows, while still ensuring a proper finisher before the boss dies. With this alignment, we will opt for 120s rotation timings by delaying our 2nd and 4th DWT timings by ~10 seconds.

Phase 5: Finisher Outline

Finisher Outline
Finisher Outline

As you approach the end of the encounter, you will want to align a proper finisher burst before the boss dies. Given the outline above, you can see an example timeline where our final potion will be used to cover our last DWT and Bahamut at the very end as well as aligning our core oGCDs to also be buffed.

To perform a proper finisher burst, we should follow these priorities:

  1. Your 2nd Egi-Enkindle cooldown should be delayed to align for our potion timing near the end, as we will only have 2 casts in total throughout this phase.

  2. Your 2 Aetherflow stacks from the previous Energy Drain cast should be delayed to align for our potion timing. With proper alignment, this will allow us to cast a total of 4x Festers within this potion window, as our next ED timing will be soon after our potion is used.

  3. Only cast enough Ruin 3s while in DWT to use oGCDs such as Egi-Enkindle and Fester.

Phase 5: Devotion Finisher

Devotion Finisher
Devotion Finisher

With slower kill times that will allow for a 2nd Devotion usage during this phase, our finisher can use a more specific sequence to maximise damage gains from Devotion alignment, while maintaining the same priorities listed earlier. If you are performing a finisher with Devotion alignment, your alignment priorities will be expanded:

  1. Egi-Enkindle should be weaved following your Tri-Disaster > Dreadwyrm Trance, thus aligning the Enkindle damage to receive the Devotion buff.

  2. Your first Fester should also be weaved following your Tri-Disaster > Dreadwyrm Trance. With a very tight sequence, you are able to push a total of 3x Fester casts in the duration of Devotion.

  3. Your final Tri-Disaster should be dumped at the end of your Devotion buff, snapshotting the buff while also taking advantage of the 300 potency on hit damage.

Phase 5: Addle Mitigation

Addle in this phase will be used to mitigate the Morn Afah stacks. You should discuss with your party where you will be using Addle, as there are 5 total casts of Morn Afah.

Using 90s mitigations (Addle included) on the odd Morn Afahs will give you 3 total uses, so you should be using it on 1, 3, and 5 if you have 1 caster.

If you have 2 casters and it is your job to mitigate the 2nd and the 4th Morn Afah, do consider the timing of where you use addle for the 2nd Morn Afah. You have to use it a few seconds before the cast for Morn Afah begins, or it will be late for the 4th one.

Missing the timings of planned Addles will get party members killed.

Additional Resources

Elevation Xx’s Clear PoV - PoV Log (5.20) | Log 2 (5.18) | Log 3 (5.18) | Log 4 (5.18)