Nikke - Union Raid (UR18): Crystal Chamber [Level 10] 715.6M+ damage with sub team (read desc plz)

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The units I used for this battle are Crown, Liter, Red Hood, Modernia, and Naga. The team's Skill levels and equipment are shown before the fight begins in this video. I recommend using team for survivability, damage output, and the fact that an Electric unit like Naga is required to take out the Red Circle Water Shield this boss puts of. Also, if you get hit with an attack or fail the 3 Red Circle targets Phase, your units will be stuck with a Crystal Light debuff which decreases the affected units attack by 30% throughout the fight. If you're using this team, you should perform Red Hood's Burst I followed by III at the start of the fight to take full advantage of gaining a better score without having to worry about the boss' shield going up nullifying the damage. Best of luck and thanks for watching.
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:
www.prydwen.gg/nikke/tier-list/
To know which skill and bursts are prioritize in leveling, check this link out:
nikke.gg/skill-priority-guide/
To find out how to properly Overload your units' gear, check out this link:
nikke.gg/overload-gear-priority/