Nikke - Union Raid (UR12): Storm Bringer [Stage 5] 363.4M+ damage w/ sub team (plz read description)
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The units I used for this battle are Mica: Snow Buddy, Helm: Aquamarine, Red Hood, Laplace and Maxwell. The team's Skill levels and equipment are shown before the fight begins in this video. Besides the fact that it's weak against Iron, I recommend using team only if you're unable to use any of the units in my previous video on this boss for using this team can get difficult (Laplace was taken down toward the end of the fight). Be ready to block the moment Warning! appears on the screen since the boss will perform an AoE lightning attack that will damage and stun your units momentarily. When the Red Circle Timer phase appears, it's best to switch to using Mica: Snow Buddy or Helm: Aquamarine in order to successfully clear the phase, and if you fail, you might as well reset due to the boss unleashes a massive wind blast that can possibly wipe your team. It is also recommended to perform Red Hood's Burst I, II, & III after the first Red Circle Timer phase so that she can replenish her health while doing her massive damage attacks. Best of luck to you.
To find out which units are in the meta, I recommend checking out this tier list so that you know who to focus on when it comes to skill building priorities:
https://www.prydwen.gg/nikke/tier-list/
To find out how to properly Overload your units' gear, check out this site below.
https://nikke.gg/overload-gear-priority/