Not of This World
MachineNot at creationNot of This World is a biological species trait in Stellaris 4.5.2 that costs no trait points. It is for Mechanical and Machine species, added later, not at species creation. It gives +10% Pop Upkeep.
What Not of This World does
Modifier lines by where they apply, as the game prints them; then the trait's own effect text.
- +10%Pop Upkeep
Every 100 
Pops working as a slave or better produces 0.5 Physics Research per month.
When modification offers it
species_potential_add and species_possible_add: when genetic or robotic modification shows and allows the trait (the wording is ours).
- Never (switched off)
In the game
These machines are not from this universe and are degrading slowly.
Not of This World: questions
How many trait points does Not of This World cost?
Not of This World costs no trait points (common/traits, Stellaris 4.5.2).
Can I pick Not of This World at species creation?
No — it is not offered when a species is created (initial = no); it comes from genetic or robotic modification, events or other effects.
What is the ID of Not of This World?
trait_robot_notofthisworld
Source: common/traits/06_distant_stars_traits.txt, Stellaris Cygnus v4.5.2 (9776).