[Mithalwen]

I don't think that this has been raised yet here, but I am sure that it is significant that Gandalf feels drained after speaking the word of command. It does suggests that it requires the use of innate power rather than spell craft or learnt power. It has the safe effect as a great physical exertion. Gandalf himself understands this only when he sees the Balrog. Since they are both in origin Maia, beings of Spirit clothed in bodies, it follows that their battle drains spirit energy.

This would also be a factor in the sparing use of this "Word of Command" magic - it literally takes too much out of them. Also it seems that this power can be channelled into objects - like the ring, and maybe to a lesser degree items such as the Phial. Though I find it hard too explain The Dragon helm unless it is the power of myth... this is because magic seems mainly associated with the Maia and Elves. The Maia are beings of spirit and with the elves as they age, the fea dominates the hroa. Elves pass on some of their own strength to their children so it is not inconceivable that they can transmit strength into things that they make..

Sorry rambling again..