In the movie the Hobbit Battle of Five Armies, during Gandalf captivity in Dol Guldur (inside the cage), he and Radagast were whispering a spell, what kind of spell is that and what does it do?
Radagast is whispering part of his healing spell (from healing Sebastian the Hedgehog in AUJ). Specifically, he's saying "Na coilerya en-vinyanta", which is Quenya for "Let (your) life be renewed." So Radagast is trying a little at-a-distance Wizard First Aid. I've been unable to find a direct transcript of what Gandalf is whispering. My first assumption was that it was some sort of healing or protection spell, but over time I started thinking that it was a call for help (to either Radagast or Galadriel) in Sindarin or Quenya. Someone on another site said that they watched the film in China, and the subtitles while he was in the cage read "Valar, please come and protect me," so it's probable that Gandalf is actually praying for help rather than casting a spell.
My thought was that it was a quieter version of the same spell of opening he tried using on the doors of Moria's secret entrance in The Fellowship of the Ring, in an attempt to get the cage door open.