Let's talk about...  *We know that our character is a guardian of the Last City on earth and he or she was granted some of the power of the Traveler...   This make me think(all these are of course speculation)... I have heard from people in some sites ( not from bungie employes ) that only the warlock can use the power of the Traveler, I don't believe this will be the case*   Maybe warlocks have more extensive knowledge of "space magic" but they will not be the only ones. -Perhaps  "space magic" and the power of the Traveler have deferent origins but this is clearly without evidence and is very likely I am wrong- I believe that we are going to use a power, a special ability if you wish, which will be translated as the power of the Traveler. Someone could say that this is similar to the ulti ability like in MMOs, I don't believe will be exactly the same but it will share some basic ideas, though. As they say Destiny will have some mmo elements but that will be all,it will not be an mmo. Now I don't know if we are going to choose an ability from the beginning of the game (character creation) or it will be later in the game or it will be permanent or on other hand not or lastly but not least it will going to be only one ability or two or more... Many is meant to change until the launch and with so few information and so many concepts arts... our imagination can go wild~  What do you think co-user of bungie.net and maybe future co-players? (The fist-like icon in the picture on the phone right of the character perhaps is the subject of what we are talking about) ( I only use the phrase "space magic" for lack of a better one, the same way bungie itself use it)