This is a spell learned from a spell book found in the very room where Hadvar unbinds you, or, if you chose to go with Ralof, in that room as well. I really only recommend this book for those wanting to start the game on the "Master" difficulty setting, as the spell is over-powered. But, if you are a character that does not regenerate health and you get in a bind in close quarters, it is a life saver. But, after a while, you may not need it when your level is high enough. This spell is a must if you have the "Warzone" and especially the "War in Skyrim" mods added, as they allow for powerful enemies to spawn at random.

As an added bonus, I made a Dragon Priest Staff that can be smithed under the "Misc" category, that is also extremely powerful. It can cast a potent fireball at 10x the default distance the game allows. This is good if you want to clear out an area fast from a distance or are running away. Be careful, this has large AoE and can hurt allies/friendly NPCs.

Instructions; Download and unpack using the NMM or simply download, then unpack and place in the 'Steam\steamapps\common\skyrim\Data' folder. Start Skyrim launcher, click data files and then check the appropriate box, or do this from within NMM. Enjoy :D