Rollout (3.5e Maneuver)

Curling up your body, you become like a boulder tumbling down the mountainside, flattening all in your way.

This functions like the mountain avalanche maneuver, except that it can only be initiated while moving down a slope. Once the maneuver is initiated, you cannot take any actions other than move actions at your full speed to continue moving downhill, though you can change your course as long as each space you move into is at a lower elevation than your previous one. The maneuver does not end until you reach the bottom of the slope, you are forced to stop moving by an external effect or status condition, you collide with a solid barrier that you cannot deal sufficient trample damage to destroy, or you succeed on a DC 18 Tumble or Balance check to end it early (you may attempt such a check once per round). If you end up on a flat surface or get forcibly stopped by an external effect or condition, your inertia still carries you forward 3d4&times;5 feet. If you end up on another slope after rolling along a flat surface, you continue rolling (though you may roll back the way you came if the new slope faces the opposite direction of the old one). If you were forcibly stopped, you end up prone in the space where you stopped moving, and do not resume even if you're on a slope when your movement ends. If you collided with an immovable object, you stop at the location of the collision and take 1d6 damage, plus 1d6 more damage for every 10 feet you moved while rolling during that round, and fall prone. If you stopped yourself with a Balance or Tumble check, you may stop moving at any point within your current move action, and may take any remaining actions for the round normally. You cannot voluntarily end this maneuver unless you succeed on the aforementioned Tumble or Balance check, or otherwise steer yourself into a situation where the maneuver will be terminated.

You flatten all creatures whose space you enter, regardless of whether they are friend or foe, as if performing a trample attack, so long as you entirely occupy the space of the creature in question. Your trample attack deals 1d4+1½ your Str modifier damage, plus 1 damage for every 10 feet you moved during that round (assuming that you're Medium - larger creatures deal more damage and smaller creatures deal less). A creature whose space you partially pass through may either attempt a Reflex save to take half damage (DC = 12 + your Str or Con modifier + your size modifier for grapple/overrun/bull rush attacks) or attempt an attack of opportunity against you. You provoke attacks of opportunity from any creatures whose threatened area you pass through unless you trample them and fully occupy their square (if you partially occupy an enemy's space, the enemy gets a Reflex save or an attack of opportunity, but not both). You may, of course, alter your course to avoid allies or fully collide with enemies, so long as you follow the limits imposed by this maneuver.