So as a Warlock when you cast Demonic Leap with the glyph Glyph of Falling Meteor you can fall below the death line without dying.
Just a few notes from our short time playing with it,
- When you first demonic leap you appear on other screens to keep flying and eventually disappear
- If you are mind visioned you are seen at the point where you hit the death line, but the mind vision snaps back to the caster almost instantly and you disappear again
- You can move around but this appears to be client side only, the server seems to think you're falling
- Can't logout, but if you alt+f4 your camera snaps back to the point where you hit the death line however this time it remains fixed and you do appear for other people again, but fly off and disappear.
- You can respec and keep the falling meteor unkillable buff, however it's removed as soon as you hit the ground after accepting the summon like normal
- Can cast spells, but not ones that require moving (can't kill yourself with hellfire while you keep the buff though)
- Can't cancel the meteor buff
From what we can tell you pretty much need to be ported out or you're stuck.
Grim Batol: https://i.imgur.com/jwAtK.jpg
Forge of Souls: https://i.imgur.com/UleBd.jpg
Forge of Souls flying off into the distance: https://i.imgur.com/Txyc5.jpg
Maybe someone else can find more uses with/for this.
EDIT: This also works in EOTS if you jump off with the flag