Kildrak makes an opportunity attack! Note that Kildrak has the Stand Still feat, so if he hits, Dshalvur is stopped in his tracks and will not be able to finish moving to the Phoera, unless he makes a Reflex saving throw. From the feat:
If you hit your foe, he must succeed on a Reflex save against a DC of 10 + your damage roll (the opponent does not actually take damage), or immediately halt as if he had used up his move actions for the round.
So the Reflex DC is 19.