You could be forgiven for not catching it immediately from our E3 hands-on with Rift: Planes of Telara, but there are some unique things going on with the game's class system. It's hardly the first game to allow you to change classes, but the game also goes into combining them, shifting aspects, interplay between multiple class types... it's a maze of inter-relationships. Luckily, we have an exclusive video developer diary from the staff at Trion Worlds that discusses the whole setup at length, giving future players a much clearer overview of how the system works.
When players start, they choose one of four Callings -- Warrior, Rogue, Mage, or Cleric -- which determines the player's core playstyle. As they level, they gradually acquire Souls, and it's there that the bulk of a character's abilities come from. It's a fusion of the talent tree system popularized via World of Warcraft with something much more interesting, and the possibilities for mixing the different Souls together can give rise to all sorts of interesting theories. But don't take our word for it -- watch the exclusive developer diary just past the cut.