Not getting Atlas skills

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QuickTrack2866#9965 wrote:

but the mission to explore the corrupted map is still active

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Endgame Changes

Areas of Corruption on the Atlas now have a central Corrupted Nexus that is the source of the affliction. In the areas leading to the Nexus, Corruption will spill out from slain enemies and amalgamate into powerful monsters.

Upon reaching the Nexus you will begin the task of cleansing the source of Corruption. Complete this task and receive Crystalline Shards that you can use to obtain Atlas Passive Skill points.