Wall Walk: Beginning at 4th level, as a move action, you can run up or down vertical surfaces a total distance of 15 feet without making a climb check. You add 10 feet to the distance at 6th level and every 2 levels thereafter, up to your maximum run speed. You can use this ability only once per round, so you can't make a double move up or down a wall. If you do NOT reach the top or bottom of a vertical surface, you must make a climb check appropriate to the surface, or to whatever handhold you are able to reach. You cannot take 10 on this check. If you succeed on the check, you can use this ability in the next round. Otherwise, you fall or make no progress, as determined by the result of the check (fall height determined by end of travel, not beginning). You can't use this ability to traverse a ceiling or overhang. If you're going upward, and start from a horizontal surface, you gain a +5 on the first Climb check to hang on.