For new players: when you reach level 11, you will be given a "free" vip trial. do NOT use this. refresh your page. save it for level 55ish. Crypt Keys, and Skeleton Keys: do NOT use these until you are running (at least)the level 50 multi-player dungeons. Socketing Rods: save these till level 50+ legendary gear. Sylphs: get Gaia or Iris first, or at a similar time. try to keep them the same level as you. Gaia deals the most damage, and iris is for support.
Gonna expand on that idea. Being able to trade up to a certain limit of resources with other players, even if only between clan members or through a "trading outpost." Thanks for Considering :D