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The Soulfire Bastion dungeon in Last Epoch is a challenging, high-reward endgame activity located in the Imperial Era, near the Felled Wood area. To enter, players need a Soulfire Bastion Key, which can be farmed from Timeline bosses, random enemy drops, or the Arena of Champions (though the latter has a low drop rate). Right-clicking the key highlights the dungeon’s location on the map for easy navigation Last Epoch Gold.

Core Mechanics 
Soulfire Bastion is themed around Fire and Necrotic damage, and its signature mechanic is the Soulfire Shield. This shield grants immunity to either fire or necrotic damage but not both simultaneously. Players toggle between these immunities using the shield ability (default bound to D), indicated by a glowing bubble around the character—orange-red for fire immunity and green for necrotic immunity. All enemies and traps deal either fire or necrotic damage, so switching immunities at the right time is crucial to avoid heavy damage from attacks like Wall of Fire and Collapsing Decay.

Switching the Soulfire Shield consumes a resource called Soul Embers, which are gained by killing enemies throughout the dungeon. While each switch costs one Ember, players accumulate hundreds or even thousands during a run. Soul Embers are also banked across runs, so players don’t need to hoard them excessively and should switch immunities as needed to survive.

Dungeon Layout and Progression  
The dungeon has four tiers, each increasing in difficulty and rewards. Players start at Tier 1 and must complete it to unlock higher tiers. The higher the tier, the tougher the enemies and bosses, but the better the loot, including rare exalted gloves, belts, and boots that are unique to this dungeon.

Boss Fight: Cremorus  
The final boss, Cremorus, requires players to master the immunity-switching mechanic, as the boss alternates between fire and necrotic attacks. Avoiding high-damage attacks while maintaining the correct immunity is key to victory.

Rewards and Strategy  
At the end of the run, players can spend leftover Soul Embers at the Soul Gambler vendor, who offers powerful unique and set items, some exclusive to the dungeon. Movement speed and mobility skills are highly recommended for navigating the dungeon and dodging boss attacks efficiently buy Last Epoch Gold.

Summary 
Soulfire Bastion is a high-risk, high-reward dungeon that tests your ability to manage immunities against fire and necrotic damage. Success requires smart switching of the Soulfire Shield, good positioning, and efficient enemy kills to maximize Soul Embers for gambling rewards. It’s a vital dungeon for players seeking rare gear and unique affixes in Last Epoch.