Use defensive skills to offset her high-damage skills when you cannot win the clash. If you're still stuck, let me know: Which identities (characters/IDs) are you currently using? Are you losing to the high damage or the bloom effect ? I can give you a more customized team setup!
Utilize AoE E.G.O. skills to target the trees and the boss simultaneously. 4:48 subtitles English
If a Sinner is trapped, focus on winning clashes to free them. Use defensive skills to offset her high-damage skills
The fight against Dongbaek is a three-phase battle, with Phase 2 starting on Turn 3, where she spawns 4 "Spicebush" trees. I can give you a more customized team setup
Bring IDs with Slash damage, and avoid/minimize Pierce damage dealers.
Here is a detailed breakdown of the 4-48 fight based on community insights:
Focus on winning clashes, especially during the first 3 rounds, to manage Sanity and prevent Blooming.