Prevents all skyfalling objects from "hitting" roofs - this mostly has the effect of making it so that drop pods won't collapse roofs where they land. This doesn't effect any kind of targeting, so enemy raids still won't try to drop through overhead mountain in the first place (and you can't target your own pods on those tiles either).
For constructed roofs or in situations where it bugs out and drop pods do try to fall into mountain tiles, they will pass smoothly through the roof without collapsing it as if it wasn't there.
Shuttles from Odyssey reuse the same code (Skyfallers) and will likewise be prevented from e.g. colliding with mountain roofs when parked too close.
