Anyone get the suspicion that the Oort might be the D'ni by a different name?
✔ Mysteriously dead or gone civilization
✔ Remnants of their civilization are strewn about many, many worlds.
✔ Said worlds are connected via portals
✔ Many of those worlds are very ...unique, and possibly obey different laws
✔ They use an interesting runic (and probably highly structured) numeric system
✔ They're viewed as largely benevolent
Did the Oort, perhaps, make all these worlds we're playing on?