The Horizon Signal: - message ends -

… complies with a mixture of reluctance and relief. Their cognitive report later indicates that they are subject to recurring visions - of impossible labyrinths, the hungry vertigo of interstellar space, and their name called in the dark. Within a homeworld year, the message has ceased.

The command below will trigger the "The Horizon Signal: - message ends -" event in Stellaris:

When this event fires, you can choose between these 2 options:

• We have escaped something.
• We have lost something.

Stellaris events fire in chains — one event leads to the next. Here is how The Horizon Signal: - message ends - (akx.9006) connects.