Anna as a Support and Lynn as the main Fighter in Fafnir - Dislyte

Important things to note:
This is not an auto team and might not ever work as an auto team because it is RNG-reliant because of Ethan's Ocean set for his 2nd ability, Lynn will use her 3rd ability during the 2nd wave, and Anna's chance of landing a critical hit on Fafnir, ruining Yun Chuan's attack and he gets frozen.
I just wanted to give Alice as much speed with the Relief/Aegis sets.
I wanted R2 Ethan to be the 2nd fastest with a lot of ACC to land the DEF DOWN debuff on Fafnir (if you have his 2nd ability fully upgraded, you don't need to use Ocean set).
I made Anna the 3rd fastest with Harmony/Immunity sets, and you don't need to focus on any stat in particular (maybe some ACC). Just don't build her as a fighter esper.
R2 Yun Chuan is a bit difficult to build around because he needs to one-shot the first wave with his 3rd ability, but he can't go through Fafnir's first HP bar with his S3. I built Yun Chuan with a high C.RATE and a decent amount of ACC to land the SEAR debuff.
Lynn is easy to build, focus on as much damage output as you can get (high attack, C.DMG, a little less C.RATE because of Ethan's buff and Alice's C.RATE/SPD/ATK buffs) and make sure she can take her turn before the boss' minions.

[@marcctwain8504]

This isnt 4 turns ☹️

[@ApEnjoyer]

Never said it was.