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There's also one quest on the merian isles, I don't remember quite what it was about, a fairly recent one, helping a person in a hut with a research. It was also fairly lengthy ( really forget the details, but can go look if needed ) that also didn't give a honour line nor anything else substantial ( apart of some lore, I believe, lore's always good ).
Dionamus spire ( either side ) is iirc not tracked still ( couldn't find it at least ) and has no way / hook up anymore since the observatory got torched, so I'm not sure how you'd even get started if you wouldn't alreayd know how.
Balloon? That works still right? /knows literally nothing of these things
Rhapsody's being locked behind an emote doesn't sound right considering how the others work.
You can not get to Dio without gates or artifacts.The normal way was the teleporter in the Observatory which is now destroyed. Edit: Seeing as the teleporter also was the way to Icewynd as far as I know, you might want to make a way there too while you are fixing the way to Dio.
Having just done the quest mentioned above for the first time and hunting after the loti, it took ( with a little break ) about 2 1/2 hours to hunt down the loti. I was not very efficient about it am sure and I was kind of hitting the odd mob on the way to keep myself entertained, but at the very least I feel that a quest like that one should have -some- form of reward. I got exactly nothing, not even a thank you from constance, which I feel is a little sad.