To clear this up for everyone not yet experiencing this, I think it's about time to really start escalating this harder. It's not 'impossible' but it's nearly impossible thanks to an insta-kill mechanic that is laggy and extremely inconsistent.

The mechanic in particular is called Twister - as far as anyone has been able to find out, you just run out of it. It is an insta-kill period, there is no amount of gear that will make it easier. And you can run out of it. Sometimes. When the server likes you. This IS in the Accepted Bugs forum, so yes, it's extremely likely that there is no other secret to it (link to said thread will be provided below).

A lot of guilds have been quiet on details due to shooting for world first, but at this point, we're all experiencing the same thing, admitting or not.

Video demonstrating the issue: https://www.youtube.com/watch?v=sHo3AewOwog

Link to the bug thread: http://forum.square-enix.com/ffxiv/t...mechanic/page2