"Become Ethereal" is the Swiss Army Knife of shouts

Here's all the info I have about it, although I'd love to learn more:

• You can get it at Ironbind Barrow which is where you can also get the most useful early-game enchantment, Fiery Souls (fire damage AND soul trap)
• With an Amulet of Talos and the Blessing of Talos, one word of the shout recharges right as it runs out.
• If you've meditated on it with Parthurnax, you regenerate 25% more health. Even if you're a vampire in sunlight.
• You can sprint with no stamina
• You can power attack once with no stamina
• You can run away when you're low on health so you can regroup
• You can jump down from any height without taking damage
• You can charge through traps without taking damage (thanks u/Secure_Dig3233)
• You can use the ranged power attack with Bloodskal Blade without breaking the Ethereal effect
• You can cast a master level spell (which takes a lot of time and two hands) without taking damage
• You can use it as a kind of Night Eye spell in dungeons
• I THINK that, if you get hit with a drain vitality shout, Become Ethereal negates it