First chamber might be the harderst one ever. Just cause there are too many enemies. There are teams that can clear it easly, but not everybody has access to them. Clorinde/Neuvillette are my favorites this rotation. I hope next abyss is as challenging as this one
That's actually a 3* weapon, and a healer is must needed to get the passive of cri rate, it's good but also has some cons, if craftable 4* iron sting is used, this team can have raiden instead of kuki, which can boost the damage and energy recharge!