Duration: 14:04

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Poseidon-
You can brute force this with a strong Yui and Mia. You will eventually want everyone to die except Yui and Mia so Yui can focus heal her.
Lugrant and Ariel are there to provide elemental damage reduction from water enemies.

Kalisia-
Water team is best here with Vivien, Ariel, Aina, Airi. You can also use Aqua in place of Airi/Ariel.
Aina is there to provide elemental damage reduction from Fire element. Vivian and Ariel provides shields and Airi provides additional damage reduction to the team. After a certain damage threshhold, your team gets 50% buff duration reduced debuff, so if Vivian's cooldown is 14s. Her shield really only lasts for 7s, meaning the remainder of the 7 seconds you have to stall with other skills, something like an Ariel or Airi skill paired with an Aina skill and a Cain quick slash should be enough to stall 7s. Rinse and repeat that cycle.

Ariel-
This boss performs an active skill every 10B which can be interrupted by a stun such as Ryu's. Instead of using Efreet in my old team, I used Ariel instead however you should experiment with both and see which is better for you. The strategy remains the same. Reach 10B while saving as many skills as possible. When the boss begins its skill, burst as much damage as you can with the stun being the very last skill. Keep in mind the boss prepares her ult for about 2.5 seconds so you can stall too. When the boss is stunned, they are stunned for 10s so do not use any skills during this time and allow for your team's skills to cool back down. If you use them during this 10s stun, it will eat against that time and your team's skills won't cool down in time to stun the next active skill. Ideally you burst as much as you can each rotation because eventually the boss will get tankier and it will be harder to reach the next 10B increment without your team dying to the boss's crazy damage. Hence why you need to burst every 10B increment so that when the boss is done with the 10s stun, they automatically go into their active skill animation as opposed to attacking your team. This is how you get past the higher damages.