Become Ethereal

Become Ethereal is a Dragon Shout in The Elder Scrolls Skyrim V

This shout makes you invincible for a short time, however you can't attack while using it. This shout can also be used to jump off high objects, even mountains.

It was revealed on october 21 in an interview with Todd Howard on Gametrailers.

Reference

http://www.gametrailers.com/episode/gametrailers-tv/137?ch=1