Crescent Grove boundary bypass
Here's a video of a method to get out of bounds in HARD Crescent Grove.
It's hard to see here but the technique I used to gain enough elevation was to first stand atop the switch in the patio(?), then I'd double jump, dash backwards to gain a little height, and finally time my aerials so that I'd always be ascending.
While I haven't tested with other classes or weapons I am pretty certain all classes could make it up there, given they are using a sword or a mace, as you can't really use any other weapon to ascend and move forward at the the same time. Platforming from out of bounds should be possible with all classes.
One thing to keep in mind is that some areas are not intended to be sequence broken or accessed in alternate level variations. At the end of the video you can see how I was trapped after attempting to skip to the final portal. I'm not certain if there are any workarounds to escaping but given I had no clear way to damage myself and respawn it's safe to say that I didn't have any options lol. Maybe life tap could get you out of there.
Also, watch out for invisible walls (I don't know how you can but just be careful lol). At 1:53 you can see me almost dying.
If anyone knows the map variation please leave a comment, I'm having a difficult time matching it on the wiki.