Mortal Shell 2 Solnir, the Gloom Seeker Boss Guide
Quick answer: If Solnir is not taking damage, put the blue flames out first. Solnir Shard is the unique drop.
Official promotional screenshot: Steam / Cold Symmetry / Playstack
Location and route
Boss location: Faded Citadel, past Citadel Annex / Faded Citadel Gate Beacon.
Cleanse the Faded Citadel Gate Beacon. Gaming ProMax: the fight sits between two blue flames — extinguish them before damage sticks.
Preparation checklist
- On the Isaac / Faded Citadel sweep.
Attacks and counters
| Attack | Tell / danger | Safe response |
|---|---|---|
| Blue-flame immunity | Two flames in the arena | Extinguish, then fight normally. |
Step-by-step fight plan
- Lights first, boss second, loot Shard.
Rewards, achievement, and what comes next
- Glimpse x1, Solnir Shard, Gloom x13,885 (Game8).
More boss guides
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- Tishina's Confessor
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- Tarblighted Stoner
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- Stray Sesters
- Bor, the Deluded Monarch
- Sariel, the Endless
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- Viletongue Batushka
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Evidence: The boss name and achievement wording are cross-checked against the official Steam achievement list. Location, attacks, rewards, and strategy are attributed community synthesis checked against this Game8 Faded Citadel table and Gaming ProMax flame note. Verified August 23, 2026; balance and behavior may change with patches.