Nikke - Union Raid (UR15): Stout [Level 4] cleared in one run
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The units I used for this battle are Tia, Liter, Red Hood, Naga and Maxwell. The team's Skill levels and equipment are shown before the fight begins in this video. Unless you don't have Scarlet nor Anis: Sparkling Summer, I recommend using this team for survivability, but would have to look for an alternate when dealing with higher level difficulty due to the boss' increased Hp. Best of luck to you 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:
https://www.prydwen.gg/nikke/tier-list/
An alternate way in knowing which skill and bursts are prioritize in leveling, check this link out:
https://nikke.gg/skill-priority-guide/
To find out how to properly Overload your units' gear, check out this link:
https://nikke.gg/overload-gear-priority/