Well I noticed that we had a idea of what the Oort are and where,but no one has come up with a back story,so here's what I think happen to the Oort.
Tell me what you think,add to it if you like!
The Oort where a highly intelligent and peaceful race of humanoids,they settle on distant planets because their home world had died long ago. They never just settle on one planet,because they needed things from multiple planets at all times. If they need gold they'd go to Agabab,if they needed food and water they went to Versatel, for it was the most life filled world. Everything was going well for the thriving race,until they discovered a world filled with giant beast with power beyond any thing they had seen before, they called Titans. They tried to go back throw the portal,but it was to late;Titans burst through the portals,killling Oortians everywhere. The Titans spread throw all the portals the Oortians had created. They rampaged throw the universe killing all the Oort in every world they found them on. Until there where no more Oort to kill,they where gone,on every world,in every universe. The Oort where extinct,never to be seen again.