Author note: Written by Jachin, a 23-year Resident Evil series fan based in Seoul, South Korea. This guide is based on 6 full RE9 playthroughs on PS5 and Steam (Casual → Insanity → NG+ Insanity completions). All strategies, timings, and locations have been personally tested across the v1.02 patch. AI tools were used only for grammar review and note organization; no AI-generated content appears in strategy analysis.
Verified on: v1.02 + DLC patch · Last reviewed: May 30, 2026 · About the author · Editorial policies
Blister Borne Insanity is the first major test. 5m distance maintained. Blister glow = 0.5s warning before 360-degree pop. Knife-only kill = Predator charm. Required for Trophy + future Insanity runs.
Before engaging Blister Borne on Insanity NG+, equip the recommended charm loadout and stock the recommended weapons. This fight punishes underprepared players.
Each boss has specific attack windows requiring sub-second precision. Practice on Standard difficulty first to memorize the patterns, then attempt Insanity NG+ with confidence.
Defeating Blister Borne on Insanity NG+ unlocks specific audio logs, codex entries, and trophy progress. Many players miss these because they only play Standard difficulty.
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