u/Fit_Zucchini_4029

I just finished reading Eragon Inheritance cycle. In the forth book, inheritance, when Eragon, Saphira and Glaedr are visiting Vroengard for the first time, before going into the Vault of Souls, Eragon was sitting watching the ruins of the old city from above when he saw hooded creatures walking with some sort of light, and then disappearing one by one, what are those creatures?