From publisher blurb:
On a battlefield where positioning is key, the portalist is king. By uncovering the secrets of leaping through hidden tears in the fabric of reality the portalist changes the rules by which ordinary melee is fought. Part warrior and part planar sage, the portalist keeps himself lightly armored and lightly armed, maximizing his ability to move in ways previously thought impossible. A true rarity, some portalists form a secret order dedicated to the mysteries of dimensional travel, while others are loners who study the secrets of teleportation on their own. Individual portalists are as different as the style of portals they create. Many are flashy, travelling through inter-dimensional wormholes with a cacophony of thunder and lightning, while others silently slip in and out of the world through tiny fissures near-invisible to the untrained eye.