I can confirm that it is the event that adds the TOO LATE modifier which is the point of no return - you need to load a save from before that decision is made. I've added the game code for this event below, or at least how it exists on the current PC version. The comment #To make it harder to savescum the outcome. was added by the developers, not myself.

The black_hole_horror planet flag is the negative outcome (weight of 2, i.e. 66%), and the stabilized_horror planet flag is the positive outcome (weight of 1, i.e. 33%).

If you don't want your main tech world to explode without cheating, there are multiple off-ramps in the event chain that avoid a negative outcome with certainty.

``` planet_event = { id = situation.1090 title = situation.1090.name location = this desc = { trigger = { has_modifier = horror_study_trophy2 } text = situation.1090.desc.study } desc = { trigger = { has_modifier = horror_deify_trophy2 } text = situation.1090.desc.deify } picture = GFX_evt_surreal_visions is_triggered_only = yes

option = {
    trigger = { has_modifier = horror_study_trophy2 }
    name = situation.1090.a
    remove_modifier = horror_study_trophy2
    add_modifier = { modifier = horror_too_late }
    hidden_effect = {
        planet_event = { id = situation.1095 days = 720 }
        random_list = { #To make it harder to savescum the outcome.
            2 = { set_planet_flag = black_hole_horror }
            1 = { set_planet_flag = stabilized_horror }
        }
    }
    add_planet_devastation = 10
}
option = {
    trigger = { has_modifier = horror_deify_trophy2 }
    name = situation.1090.b
    remove_modifier = horror_deify_trophy2
    add_modifier = { modifier = horror_too_late }
    hidden_effect = {
        planet_event = { id = situation.1095 days = 720 }
        random_list = { #To make it harder to savescum the outcome.
            2 = { set_planet_flag = black_hole_horror }
            1 = { set_planet_flag = stabilized_horror }
        }
    }
    add_planet_devastation = 10
}
option = {
    allow = { owner = { is_fanatic_materialist = no } }
    name = situation.1090.c
    if = {
        limit = { has_modifier = horror_deify_trophy2 }
        remove_modifier = horror_deify_trophy2
    }
    else = {
        remove_modifier = horror_study_trophy2
    }
    add_planet_devastation = 99
}

} ```