Quick Answer

Most players can clear Act 1 surface, do Underdark, then visit Mountain Pass and the creche before entering Act 2. They are not a simple either-or; the important part is respecting lockout warnings.

StageWhat To DoWatch Out
SurfaceHandle grove, goblin camp, swamp, and villageFoundation XP and companions
UnderdarkGain gear, XP, and forge leadsFights are harder, so level first
Mountain PassDo creche and githyanki contentBring Lae’zel for context
Before Act 2Read journal and warningsCheck vendors, side quests, and camp scenes

Key Checks

  • When the game warns you, stop and audit quests.
  • Doing both routes makes Act 2 smoother.
  • Do not rush main story at the cost of levels and gear.