The Fallen Star in PoE 2 is an Expedition endgame destination and boss area, not something you reach through the Atlas. You get there by progressing the Expedition questline, talking to Captain Makoru in the Ruins of Kingsmarch, and using the quest items from the boss chain to unlock the trip.

What it’s for

  • It is the final part of the Expedition story chain.
  • It leads to a boss encounter tied to that questline.
  • It is meant as a reward/progression point after clearing the related Expedition bosses, not a random map objective.

How players get there

  1. Finish the Expedition-related quests.
  1. Defeat the required bosses to obtain the key quest item.
  1. Bring the item back and speak with Makoru in Kingsmarch.
  1. Use the unlocked travel option to reach The Fallen Star directly.

In plain English

Think of it as the capstone of the Expedition content: you clear the chain, turn in the required item, and get access to the destination and its boss.

TL;DR

The point of The Fallen Star is to serve as the end of the Expedition questline and unlock a boss fight plus endgame progression reward.