So here earlier this evening, i was bored and flying around the Dalaran sewers as a wasp, when i found a hole in the invisible wall.
I tried to search for "Dalaran, Flying in Dalaran" etc. but found nothing.
I'll show you a little guide with pictures here how to use it(I know my name can be seen, but i have posted stuff before where it is shown without anything happening)
First off. You can do it with the wasp form from the underbelly elixirs, or you can do it with a "small" flying mount.
If you do it with a mount, you have to fly down through the Dalaran sewer.
When you get into the sewers, make sure you are in the right end. It's the end with the ramp leading back up again.
When you are down there on your flying mount. Fly up to the roof, and move to the side, while "hugging" the roof, as illustrated in this picture.
When you have passed the invisible wall, try to make your way down between the pipes. As this picture shows (Here i was in wasp form, but works fine with mount too).
When you have reached the bottom, you can fly at the top of the water, and from there you should be able to see "glitched" air, which you can fly through. As shown below
Now feel free to explore the depths of Dalaran. I myself flew into the Dalaran Arena to have a look.
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