PoE Delve Atlas Tree 3.28

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.