Nikke - Union Raid (UR7): Sinister [Stage 3] 141.4M+ damage
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The units I used for this battle are Liter, Rupee, Sugar, Laplace, and Rapunzel. The team's Skill levels and equipment are shown before the fight begins in this video. I recommend using team for ensuring survivability and the fact that this boss is weak against Iron element units. Also, be very wary over when it comes to aiming Rupee Burst II for it might miss, and this boss does teleport to the center every now to unleashed an attack that will stun your units if not blocked. 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/