The Seething Sigh is the final boss for the 'Denial' Confession. It has multiple 'Eyes' that must be destroyed to damage the main body. Each Eye has unique properties (e.g., one applies Blight, another Bleed, another Stress). The boss constantly shuffles your party and applies negative tokens. Your strategy should involve quickly identifying and destroying the most threatening Eyes, then focusing on the main body. AoE damage is useful for clearing Eyes, and heroes with high single-target damage are crucial for the main body. Stress healing and debuff cleansing are vital.

Key Strategy:
- Prioritize Eyes: Destroy the most threatening Eyes first (e.g., Stress-inflicting).
- AoE & Single-Target: Use AoE for Eyes, single-target for the main body.
- Stress & Debuff Management: Bring skills and items to mitigate stress and cleanse debuffs.
- Positioning: Be prepared for constant party shuffles.