[Saurreg]

So we have established that there are two types of extraordinary power manipulations in Middle-earth, namely the manipulation of physical objects and the manipulation of incoporeal spirits.

But back to Mansun's question: how are such manipulations carried out? What is the way to do so? Are only maiars, the first-born and selected men (Isildur and Aragon) capable of magia and goetia. If so then why only them? Did they possess some innate ability? Did their very nature that allowed them to do so?