Stellaris: How To Defeat The Unbidden
In Stellaris, the Unbidden are beings from a dimension of pure energy. These extradimensional invaders come to the galaxy in an attempt to make the universe similar to theirs - regardless of what that means for its inhabitants. Their ships have some of the game's most dangerous weaponry, making them a particularly powerful foe.
Related: Stellaris: How To Defeat The Contingency
The Unbidden will arrive without warning, so you may need to adapt your strategy on the fly if this Crisis suddenly triggers. Defeating them requires strong fleets of your own, along with advanced technology and a healthy dose of tenacity.
The Unbidden can appear in the galaxy any time after the campaign's Endgame Year. This is chosen during New Game setup, and by default the Endgame Year is 2400. The more time passes after that point, the more likely it is that a Crisis will occur. The Unbidden will never threaten the galaxy if the Contingency or the Prethoryn Scourge have already done so.
The chance of the Unbidden appearing increases if any empire has researched Jump Drive or Psi Jump Drive, or if the Galactic Council has passed the Extradimensional Experimentation resolution.
Unlike the Contingency and the Scourge, the Unbidden Crisis begins with no warning given to any empire. The first Unbidden Starbase will simply spawn in a random system, destroying and replacing any existing Starbase. Every player will receive a notification when that happens, but at that point, the invasion has already begun.
The location of the Unbidden's spawn point, the Extradimensional Portal, is revealed to all empires thirty days after it opens. If it's within sensor range you might be able to see it before that point, but if it's close enough to pick up on
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