[Suicide Junkie]

While the waves are in contact, they add linearly, and after they separate again they still have their original form. One wave isn't affected by the other.

But that aside, it seems all our ancients can be described as energy beings that still use regular (physical) ships.
So the question remains what do to for the rare ancient species. (Mindriders, Torvalus)
We can pretty much ignore their physical form, but What is special about their Ships/Technology?