You can check the sign near the dev island south end to return to Heronstadt if you want to get anything you missed.
There are multiple endings, but if you found the developer island you are "locked out" of the other one. The next patch will allow you to view them from the Hall of Memories (hopefully due out today or tomorrow).
Thank you, didn't find dev island but missed the npc that lets you leave the endgame zone.
Only other two things I wanted to ask about is if the Luminance gloves are in their own omega area or I somehow missed them in one of the ones I have cleared.
Also wondering how to trigger the last quest. I know who its for from the achievements, but can't figure out how it starts.
You need to find the secret area in the Villa, examine the portrait of the young girl in the building near the pond and it opens a room near the fireplace in the main hall. You'll find a spooky mask there. Follow that quest.
Hopefully you can do the rest without needing spoilers. The Gloves you need will be found during that subquest as well.