[Limbus Company] RR3 Skin Prophet in 3 Turns 

The first time I fought this guy, he was resistant to most damage.
As per any sane manager would, I overhauled my team and tested various ones. Turns out Rupture works wonders on this boss, and a lot of bosses actually.. now that there isn't a cap on the potency just like Railway 2.
2 Turns might be possible if Talisclair went first on 2nd round + all the S3 of everyone else (however Don must telepole round1 and act faster than Yi Sang, since he'll need charge for Dimension Shredder to proc, it's important because of the count and passive)