-----------------------------------------------------------------------------------------------------------------------
To add shadowgate system effects, copy and paste this script into your Stellaris console (press the tilde key ~ under the Esc button on your keyboard):
-----------------------------------------------------------------------------------------------------------------------

effect random_system = { limit = { exists = space_owner space_owner = { is_ai = no } has_star_flag = giga_origin_frameworld }
	random_system_planet = { limit = { is_planet_class = pc_black_hole }
		set_planet_size = 4
		create_ambient_object = {
			type = "shadowgate_fog"
			location = this
			use_3d_location = yes
			scale = @shadowgate_fog_scale
			entity_offset_height = @shadowgate_fog_offset
		}
		create_ambient_object = {
			type = "umbral_remnant"
			location = this
			use_3d_location = yes
			scale = @shadowgate_umbral_remnant_system_scale
			entity_offset_height = @shadowgate_umbral_remnant_system_offset
		}
		last_created_ambient_object = { set_ambient_object_flag = shadowgate_shadow_remnant }
	}
}