Tree of Savior dev blog touches on a few of the game's 80-odd classes including the Linker, the Psychokino, the Sadhu, and the Necromancer. You can probably guess what's involved with that last one, but the previous three seem pretty unique. The Sadhu uses "out-of-body" skills while the Psychokino employes telekinesis. The Linker chains mobs together so that they'll "receive damages or debuffs simultaneously," according to blog author and developer Hakkyu Kim.
There are bits and bobs about Tree of Savior's non-combat classes, too, as well as info about the game's music and a class-focused video. Click past the cut to give it a look!