The Final Coil of Bahamut - Turn 2

Notice

All Lv. 50 Bahamut raids do not appear in any Duty Roulettes due to their high difficulty (comparable to Savage). Therefore, attempting to queue through Duty Finder will result in extremely long queues. For an easy completion, it is recommended that players use Party Finder and form an Unrestricted Party (i.e., with level sync disabled). Players who wish to complete this duty with level sync enabled should also form a pre-made party, which also enables the use of Minimum Item Level and Silence Echo settings for an additional challenge.

Level: 50 (Sync: 50)
Item Level: 115
Difficulty: Extreme/Savage

Party size: Full Party
8 man • 2 2 4
Unsyncing: Allowed
Time limit: 90 minutes
Phoenix Down: Not Available
Duty Finder: Raids (A Realm Reborn)
Tomestones: 30
Req. quest: Fragments of Truth
Entrance: Northern Thanalan (X:19, Y:20)
Location: IC-06 Regeneration Grid
Region: Thanalan
Patch: 2.4
The Echo: Permanent +20%

At the depth of 6,835 yalms, you and your companions are greeted by a breathtaking sight: a colossal replica of Dalamud, believed to be the device which regulates Bahamut's regeneration. The structure swarms with legions of the lesser moon's internal defenses, but through it you must go if you are to reach the main bridge.

— In-game description

The Final Coil of Bahamut - Turn 2 is a level 50 raid introduced in patch 2.4. The raid is also known as T11.

Video Guide

Objective

Deactivate the Allagan fields.
Defeat Kaliya.

Enemies

Boss

Kaliya

Phase 1 - 100% - 60%

Phase 1 Abilities
Name	Description
Resonate	A shared-tankbuster cleave.
Nerve Gas	A 90 degree frontal cone AoE and two 180 degree cone AoEs to the left-back and right-back sides in random order. Inflicts a Vulnerability Up on hit.
Barofield	A permanent AoE attached to Kaliya that lasts the entire duration of the fight, preventing players from moving under or through Kaliya. Inflicts 2500 damage, Vulnerability Up, and Heavy.
Seed of the River & Sea	Kaliya fires a blue fireball and a red fireball into the sky, but in a random order. The visuals indicate the order of the next attacks. The blue fireball from the middle head is Seed of the Sea, a Stack marker indicated by a red laser targeting a player. The red fireballs fired from the outer heads is Seed of the River, which falls on two random players excepting the main tank, both dealing 2500 damage in an AoE.
Secondary & Primary Head	Kaliya stuns the Main Tank and begins casting Secondary Head, which inflicts In the Headlights. This debuff will cause the tank to instantly die if hit by the follow-up attack, Primary Head. If the off-tank provokes too early— prior to the start of the Secondary Head cast, they will take both the debuff and the follow-up attack, resulting in death.

The first phase is fairly straight-forward, but various mechanics can catch players off-guard if not prepared.

The first attack to be wary of is Resonate, which unlike other cleaves, is an unmarked shared-tankbuster. Both tanks will have to stack together for the majority of the fight to divide the high amount of damage from this frequent attack.

The next is Seed of the River & Sea. Players will need to watch the order of the heads firing to know the order of the upcoming spread and stack attacks.

If the middle head fires first, players will need to stack together first, then spread out.
If the outer heads fires first, players must spread out first, then stack together once it is safe.

Finally, Kaliya will stun the main tank and attempt to kill them with a combination of Secondary Head and Primary Head. The off-tank must Provoke during the cast of Secondary Head to safely take the Primary Head cast away from the vulnerable main tank.

Phase 1 Rotation
Attack	Strategy
Resonate	Both tanks will need to stand in front of the boss at all times to lessen the outgoing damage.
Nerve Gas	Avoid the giant cone AoEs. Kaliya never fires in the same direction twice, which can help in finding a safe zone after the first AoE.
Barofield / Resonate	The first loop will be a Barofield cast. All later loops will instead cast Resonate.
Seed of the River & Sea	Watch the firing order of the heads. Middle-then-outer is Stack-then-spread. The reverse will be spread-then-stack.
Resonate
Secondary & Primary Head	The off-tank should Provoke during the cast of Secondary Head, not before and not after.
Repeat

Phase 2 - 60%

Kaliya will move to the center and become untargetable, additionally killing anyone that steps into the center during this phase.

Three Nodes will spawn that must be kept apart at all times. Several simple line AoEs will be fired from the center intermittently and must be dodged.

Phase 2 Enemies
Enemy	Buffs	Abilities
Weapons Node	Magic Vulnerability Down Damage Up	A cleave and an unmarked Stack marker called Repelling Cannons, hitting and dividing damage across players in melee range. This node has 2.5x more health than the Gravity Node.
Gravity Node	Critical Strikes Physical Vulnerability Down	A cleave and Void Zones, which places gravity puddles under random players that deal damage and inflict Heavy. The Critical Strikes buff causes this node to always deal critical damage with every attack.
Electric Node	Energy Field	Inflicts a random player with Forked Lightning for 5 seconds. When this debuff expires, the afflicted bursts in an AoE, damaging and inflicting Paralysis to those nearby. The Energy Field buff causes this enemy to take 0 damage from players unless they are in melee range. This node does not have an enmity table, instead slowly rotating counter-clockwise around the room.

If two nodes move too close together, they will combine, sharing their buffs and becoming significantly stronger and harder to kill. Due to the Electric Node always circling the room, each tank must grab a different node and circle the room as well.

When one node dies, the remaining node will attempt to fly over to the Electric Node and absorb it. Both Weapons Node and Gravity Node must instead be brought low and killed at roughly the same time, leaving the Electric Node alone for last.

Due to Repelling Cannons, a majority of the raid should be stacked behind the Weapons Node to spread damage, watching out for Forked Lightning being intermittently cast on a player. One caster should be dedicated to the Gravity Node, with a second DPS to help if the Weapons Node is dying too fast.

Healers may need to focus more heavily on the Weapons Node group, as they will be taking significantly more damage. The Gravity Node will do moderate damage to the tank but can be handled with some occasional single-target heals.

Once all nodes are defeated, Phase 3 will start.

Phase 3 - 59% - 0%

Kaliya will gain three buffs from the nodes in Phase 2: Damage Up, Energy Field, and Critical Strikes. While Critical Strikes will expire after Nerve Cloud, the other two buffs will remain for the rest of the fight.

Like the Electric Node, the Energy Field buff means that players must be in melee range to hurt Kaliya, but must still avoid the Barofield zone underneath.

Phase 3 Abilities
Name	Description
Nerve Cloud	Unavoidable party-wide damage cast at the start of Phase 3 and every two minutes after. The first cast will always critically hit due to Critical Strikes.
Nanospore Jet	Two pairs of players will get paired / close tethers. If players get too far from their tether partner, they will repeatedly take damage and gain stacks of Vulnerability Up. If one pair of tethered players gets too close to the other tether pair, all four players will being to take damage and Vulnerability Up. If one player in a tether pair dies, their partner will immediately die as well. Tanks will only ever be tethered to the other tank.
Nerve Gas	Similar to how it functioned in Phase 1, however now always starts with a 90 degree cone aimed at a random player. The following 180 degree cones will hit the areas adjacent to the initial cast.

The first Nerve Cloud of this phase will always hit extremely hard, potentially lethally. Players should use Reprisal, Addle, and Feint to reduce the damage of the attack as much as possible.

Additionally, if Minimum IL is active, a Tank Limit Break may be necessary.

Kaliya will still cast Resonate, Seed of the River & Sea, and Secondary/Primary Head during this phase. With the mobility limitations added by Nanospore Jet, dodging Nerve Gas and Seed of the River & Sea become much more difficult.

For Nanospore Jet positioning— if the two tanks are tethered, the other pair can simply stack behind the boss. If no tanks are tethered, one pair will need to go to Kaliya's left side, and the other to the right side.

A common strategy is to assign the red-green tether to one side and the blue tether to the opposite side. Those who are not tethered should move to stack on a tether for Seed of the Sea. For Seed of the River, one player per tethered pair may attempt to move a short distance away for safety, though it is a risky maneuver.

When Nerve Gas is cast, the first 90 degree cone should always be dodged by moving left to avoid tether pairs splitting in two directions. Players should move back to their positions afterwards and dodge the 180 degree attacks in whatever direction is closest.

In Phase 3, Kaliya will randomly use one of two possible rotations after casting Nanospore Jet.

Phase 3 Rotation
Attack	Strategy
Nanospore Jet	If the tanks are tethered, the DPS / Healer pair should stand behind Kaliya— otherwise one pair should stand east and the other west.
Rotation Type A
Resonate	Tanks must stand together at all times.
Seed of the River & Sea	Players should move to one of the two pairs to stack for Seed of the Sea. Tethered pairs will want to carefully attempt to spread out for Seed of the River without moving so far as to strain the tether.
Nerve Gas	Players should always dodge the first 90 degree cone by rotating left (clockwise) to prevent pairs from splitting in two directions. Move back into position afterwards and dodge as normal.
Secondary & Primary Head	As before, the off-tank must Provoke during the cast of Secondary Head.
Resonate
Rotation Type B
Nerve Gas	Players should always dodge the first 90 degree cone by rotating left (clockwise) to prevent pairs from splitting in two directions. Move back into position afterwards and dodge as normal.
Resonate	Tanks must stand together at all times.
Seed of the River & Sea	Players should move to one of the two pairs to stack for Seed of the Sea. Tethered pairs will want to carefully attempt to spread out for Seed of the River without moving so far as to strain the tether.
Resonate
Secondary & Primary Head	As before, the off-tank must Provoke during the cast of Secondary Head.
After 2 Loops, casts Nerve Cloud and Repeat

Solo strategy

As of patch 6.0, the duty can be easily cleared solo by any well-geared level 90 character.

To get to the boss arena, players need to fight through trash mobs and clear three energy fields. This is done by standing on the big blue buttons in front of them for a few seconds. To open the two last barriers, the player needs to open one, suicide by walking into the barrier (or use Return), respawn and take the other path to open the last barrier.

The boss fight is a simple matter of attacking the boss and the adds it spawns until they die, which takes a minute or so. Avoid stepping into the boss's hitbox, which inflicts debuffs, and kill the Gravity node first once it spawns.