Defeat on …!
The "Defeat on …!" event in Stellaris — flavor, choices, and how to trigger it with the event console command.
Defeat on …!

Planet eventMean time: 240 months
We have finished clearing out the nerve gas and the dead alien bodies from the tunnel network on …. It should now be safe for our colonists to move in. The primitive cities the aliens left behind will be demolished, of course, and replaced with our own advanced architecture.
The command below will trigger the "Defeat on …!" event in Stellaris:
Player choices
When this event fires, you can choose between the following option:
- Excellent.
- Gain modifier: Subterranean Cities
Firing conditions
Show raw conditions
has_planet_flag = seismic_disturbance_destroyed
NOT = { has_planet_flag = seismic_disturbance_expansion }
pop_amount > 0