Increasing Speed (GAP)

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By focusing all attention and willpower toward movement, a body can increase his maximum movement rate as he moves through the Astral. By concentrating — that is, performing no actions other than moving — a character (and creatures such as the astral dreadnought) can move three times faster than normal. This brings an intelligent basher within the same league as the githyanki, although the githyanki are still going to be considerably faster. A githyanki's movement rate of 96 cannot be increased by concentrating, fortunately for everyone else on the plane. That may very well be as fast as a mind can move on the plane.
Maneuvers at tripled speeds are more difficult. Any attempts at sudden stops, loops, etc. are made with a -2 penalty on an Intelligence check.
Long-term concentration to move faster fatigues a basher mentally. A body can only keep up such a stressful focus for a number of rounds equal to ten times the character's Constitution score. After such a time, the cutter must rest his weary mind (basically by sleeping or resting without focusing his mind) for at least a number of rounds equal to his Constitution score.
A planewalker who's increased his speed to its maximum begins to slow down as soon as he ceases the intense concentration required to reach that velocity. This is because of the mental drag described above. If any part of a traveler's mind thinks about something other than moving, it slows him down. Thus, a cutter can perform all the actions he wants while moving at his standard movement rate, but can do nothing when at this increased speed.