Deimostride (9-10)

20 feet. Deimostride continually exhales black smoke that creates Concealment in an aura around him. Deimostride and his riders can see through this smoke. A creature that begins its turn in the area becomes Sickened 2 (DC 23 fortitude negates) and is then temporarily immune sickness from the smoke for 1 minute. Deimostride, his rider, any creature currently holding its breath (or that does not need to breathe), and any creature immune to poison are immune to the aura's sickened effect but not the concealment.

Deimostride Strides or Flies up to triple its Speed. Its hooves burst with intense flame, dealing (6d6-2) fire damage (DC 28 reflex save) once to each creature other than his rider that he moves adjacent to during its gallop.

Large or smaller, hoof, DC 28 reflex The monster Strides up to double its Speed and can move through the spaces of creatures of the listed size, Trampling each creature whose space it enters. The monster can attempt to Trample the same creature only once in a single use of Trample. The monster deals the damage of the listed Strike, but trampled creatures can attempt a basic Reflex save at the listed DC (no damage on a critical success, half damage on a success, double damage on a critical failure).