Guide to Last Epoch's 3 Key Dungeons

Lightless Arbor (Ruined Era)

Accessible in the early-to-mid game, Lightless Arbor revolves around the Burning Amber mechanic. Upon entry, you carry this artifact, which reduces damage dealt to enemies outside its light radius but increases the damage they take from you. Crucially, the light radius shrinks whenever you take damage, making positioning and crowd control essential.

The dungeon culminates in a fight against The Mountain Beneath. This boss is technically invincible; to progress, you must destroy the root walls on both sides of the arena and ignite the fires near the kindling. Collapsing the mountain reveals Stone Titan's Heart, which serves as the actual target for your attacks. After the fight, you reach the Vaults of Uncertain Fate, where you can spend gold on items. You can choose to accept random prompts to add extra chests, though declining options may increase the cost of subsequent choices.

Soulfire Bastion (Imperial Era)

Soulfire Bastion focuses on elemental management. Throughout the dungeon, enemies will deal both Necrotic and Fire damage. To survive, you must use the Soulfire Shield to toggle immunity between these two types. Switching modes consumes Soul Cinders, a resource dropped by defeated enemies.

The boss encounter is straightforward, requiring you to focus on floor effects and timely shield switching. Once the boss is defeated, you can use your accumulated Soul Cinders at a vendor for Soul Gambling. This gacha-style mechanic allows you to trade cinders for items of varying rarities, including Rare, Exalted, Unique, or Set items.

Temporal Sanctum (Imperial Era & Ruined Era)

The Temporal Sanctum is a mid-game dungeon that requires traveling through the Shining Cove in the Imperial Era to access the Ruined Era. Upon entering, you gain the Temporal Shift ability, which allows you to jump between the Divine Era and Ruined Era dimensions. This is a powerful tool for bypassing obstacles or dodging the attack patterns of the boss, Chronomancer Julra.

The most significant reward for clearing this dungeon is access to the Eternity Cache in the Divine Era. This is the primary location for crafting Legendary items. To forge a Legendary item, you must place a Unique item with Legendary Potential alongside an Exalted item that has four unsealed affixes. The process transfers a random number of affixes from the Exalted item onto the Unique item based on its Legendary Potential.