In Path of Exile 3.28 (Mirage League), Delve has become significantly more profitable because fossils now primarily drop from Delve encounters and have been removed from many other league mechanics like Legion, Ritual, and Expedition.
Delve Atlas Tree
Count
Name
Category
Description
6
Delve Sulphite Quantity
Normal
Voltaxic Sulphite Veins and Chests in your Maps contain 6% increased Sulphite
1
Mining Byproducts
Notable
Voltaxic Sulphite Veins and Chests in your Maps have 15% chance to contain double Sulphite
Delve Atlas Tree
Count
Name
Category
Description
10
Delve Chance
Normal
Your Maps have +10% chance to contain Niko
Scarabs dropped in your Maps have 10% increased chance to be Sulphite Scarabs
1
Frantic Mining
Notable
Your Maps have +20% chance to contain Niko
Scarabs dropped in your Maps have 20% increased chance to be Sulphite Scarabs
Delve Atlas Tree
Count
Name
Category
Description
1
Sulphite Infusion
Notable
Your White Tier Maps grant 400 additional Voltaxic Sulphite on Completion
Your Yellow Tier Maps grant 700 additional Voltaxic Sulphite on Completion
Your Red Tier Maps grant 1000 additional Voltaxic Sulphite on Completion
Delve Atlas Tree
Count
Name
Category
Description
1
Guarded Hoards
Notable
Voltaxic Sulphite Veins and Chests in your Maps are guarded by Sulphite-hoarding Monsters
1
Packed with Energy
Notable
When you interact with Voltaxic Sulphite Veins or Chests in your Maps gain Sulphite Intoxication for each Voltaxic Sulphite Vein or Chest found
(Each stack of Sulphite Intoxication grants 35% increased Damage, 15% increased Movement Speed and +1% to all maximum Elemental Resistances. Sulphite Intoxication lasts 60 seconds)
Delve Atlas Tree
Count
Name
Category
Description
1
The Price of Progress
Notable
Voltaxic Sulphite Veins and Chests found in your Maps contains Doomed Spirits
3.28 Progression Strategy
Early League (Atlas Completion): Combine Delve nodes with map sustain nodes (like Shaping the World) and "fast" mechanics like Shrines to quickly progress through your Atlas while stockpiling Sulphite.
The "Unwavering Vision" Option: For a focused "alch and go" style, some players use the Unwavering Vision keystone early on to gain 20 extra Atlas points, which can be dumped into full Delve and Shrine nodes for a massive power boost during map progression.
Fossil Farming: Because of the 3.28 changes, focusing on horizontal farming at depth 280+ is currently one of the most consistent ways to generate currency, as you can efficiently target-farm specific biomes for high-value fossils.
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