Bring IDs with Slash damage, and avoid/minimize Pierce damage dealers.
Based on the provided search results, the query refers to the notoriously difficult boss fight in (Dongbaek encounter), specifically discussing strategies for English-speaking players. The discussion focuses on mechanics, team building, and tips to overcome this "gatekeeper" stage. 4:48 subtitles English
Dongbaek applies "Blooming" to sinners (stacks up to 5 times). Bring IDs with Slash damage, and avoid/minimize Pierce