Become Ethereal
The Thu'um reaches out to the Void, changing your form to one that cannot harm, or be harmed. Words: FEIM (Fade), ZII (Spirit), GRON (Bind) Become Ethereal allows the user to turn incorporeal for the spells duration negating all damage effects providing that you dont attack any enemies or otherwise interact with the world in any way. Pretty useless, you might think at first glance. But wait. There are in fact several fantastically useful functions for this unassuming little shout. The first word FEIM will allow you to turn Ethereal for 8 seconds while learning the second and third word in the phrase increases the duration to 13 and 18 seconds respectively. You can also meditate on the first word with the dragon
Paarthurnax; thisll increase your health regeneration by 25% while the shout is active.
Uses: I found myself using this shout repeatedly once I realised its potential. In Ethereal form you cant be hurt, provided you dont interact with the world; that doesnt mean you cant jump from the highest mountain you can find and walk away unscathed though. You can also sprint for the entire duration of the shout worry free as while under the effects you dont consume stamina. It can close a gap between you and a tough ranged foe leaving you unharmed, it can allow you to phase through traps of any kind and if you can summon creatures to help you, doing so right before you cast this shout is an excellent way to lose your enemy's immediate attention. You can even cast a spell such as Fire Cloak, followed by the Become Ethereal shout (which wont cancel the spell) and watch safely as your enemies burn around you.
Where to Learn: FEIM:
Ironbind Barrow ZII:
Lost Valley Redoubt GRON:
Ustengrav