Stellaris Subterranean Civilization: Peaceful or Hostile? (Full Event Guide)
Stellaris' Subterranean Civilization event: what Establish Communications vs Preemptive Strike/Destroy actually gives you, and which path is better.
Stellaris The Doorway: Every Possible Outcome Explained (Is It Worth Investigating?)
Stellaris' Doorway event explained: all 5 random outcomes (Null Void, High-Energy Dimension, Mirror Mirror, and more) and whether it's worth investigating.