Siege vehicles in World of Warcraft, Wrath of the Lich King will be pilotable by players and look to be quite powerful. Unfortunately, their use will be limited to the Lake Wintergrasp and Northrend Battleground zones. Currently, none of them can travel through water. Different races have different siege vehicles (similar to mounts), but they can be used by any race. They are not owned like a mount or used as an inventory item like any World of Warcraft mount. They are all relatively slow as far as travel speed, and some can carry more than one player. These siege vehicles definitely look like they will have a significant impact on World of Warcraft's Player vs. Player (PvP) combat