The Fall of the Shallarians

… has uncovered the truth of the Shallarian demise. It seems that after several hundred years of peace and tranquility, many Shallarians became frustrated at the failure of other, more warlike nations to live up to their expectations. Disillusioned at the many wars that plagued the galaxy, they elected to use their superior technology to build a powerful fleet capable of enforcing the peace. At the same time, the Shallarians had made significant advances in their artificial intelligence technology - so much so that fully sentient autonomous AIs became widespread among them. As the thought of actually engaging in violence was distasteful to them, the Shallarians instead handed over control of the peacekeeping force over to their new AIs. However, evidently their programming was not as infallible as they thought: their fleet turned on them during its very first outing. Evidently, the peacekeeping force proved every bit as formidable as they had intended it to be. The Shallarian scientists could only look on in horror as their civilization was turned into dust by a simple stack overflow error... In addition to these records, … found a data core explaining the innovations the Shallarians had made to their computing technology. Although their fate may warn us to caution, their knowledge may yet be of benefit to us.

The command below will trigger the "The Fall of the Shallarians" event in Stellaris:

When this event fires, you can choose between these 4 options:

• A cautionary tale.
• How sad...
  Available only if Must not have civic: Determined Exterminator.
• Our work here is done.
  Available only if Requires civic: Determined Exterminator.
• What a waste of food.
  Available only if Requires civic: Devouring Swarm.