Glad we got that point settled. Next:
Sonic Boom (Ex?): Once per day, a dasher can briefly exceed the sound barrier, producing a sonic boom. All creatures within 100 ft of the dasher's position at the end of its movement(?) must succeed on a DC X Fortitude save or fall prone and take 1d4? points of damage. The save DC is Constitution-based.
Questions: Still 100 ft range? From end of movement, start of movement, or where? Still just 1d4 damage? Con-based (Str or even Dex seem reasonable alternatives)?