This article has been verified for the current PC version (3.5) of the game.
The Doorway is a colony event chain that has a very small chance to trigger 2 or 3 years after any colony has been founded. It offers 3 mutually exclusive paths determined at random.
What can only be described as a dimensional portal has been discovered in a remote location on [colony name]. Weather prediction algorithms noticed a strange air current, which was eventually determined to be caused by the slight leakage of atmosphere into the portal. The rate of loss is far too small for it to make any difference to life on [colony name], but the very existence of this portal raises some disturbing questions, such as where does it lead to, and could something come through the portal from the other side?
The Portal seemed to react in some way to the thoughts of nearby observers, some more than others. Through a process of elimination it was possible to find a large number of people who were especially potent at influencing the Portal, and together they were able to effectively will the Portal to close. The experience was enlightening and provides strong evidence that it is possible to harness and direct belief in tangible ways.
The Portal proved to be sensitive to Psionic powers. By collecting a number of Psionically powerful individuals together, they were able to effectively create a Psionic barrier around the portal, preventing any access. The experience was enlightening and provides strong evidence that it is possible to form solid barriers from Psionic energy.
The portal on [colony name] where we sent Knight [random name] years ago is showing intense signs of activity as ragged civilians appear to be attempting to cross into our dimension. They report that Knight [knight name] has been rampaging in their dimension for a decade now, mercilessly slaughtering everyone crossing [his or her] path. [he or she] slew so many inhabitants of that dimension that a doom has befallen their society. The survivors are trying to flee anywhere they can. Could the existential pain caused by this dimension have driven [knight name] to madness?
The Dark Knight
Knight [random name], whom we sent through the portal on [colony name] years ago, has returned. Twisted and darkened, [he or she] led a host of horrors through the portal and immediately assaulted our colony. Survivors reported hearing [him or her] erupt in a demonic cackle, claiming [he or she] would soon conquer this dimension.
To Hell and Back
Knight [random name], whom we sent through the portal on [colony name] years ago, has returned. [he or she] bested many a challenge, felled countless fiends and narrowly avoided [him or her] doom, but ultimately, nothing could stand in [his or her] way. [he or she] brought back many trophies and has become a legend amongst the squires, who have begun calling [him or her] "Doomslayer".
The horrors that Knight [knight name] led through the portal have breached our defenses and conquered [colony name]!
Possessed by a major dimensional being and now titling [himself or herself] as [ruler title] [ruler name], [he or she] has called upon [his or her] demonic forces to begin the conquest of our galaxy!
Additional portals briefly opened throughout the system, but the strain on reality was too great a burden. All the singularities soon collapsed, severing the demonic host from their home dimension. Undeterred, [ruler name] is now consolidating [his or her] power base before proceeding with [his or her] plans of galactic conquest.
||Is triggered only by:
Failing to defend the colony
We shall defeat these invaders!